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Casamance, southern Senegal — the Jola country below the Gambia river, and across the borders into the Gambia and Guinea-Bissau · Senegalese & Gambian

Chicken Yassa (Poulet Yassa) — Casamance's Lemon and Onion Braise

More onion than chicken, by weight — that is not a mistake, it is the recipe. Casamance's poulet yassa marinates chicken overnight in lemon, mustard and a mountain of sliced onions, chars it over fire, then braises it back down into a jammy, sour-sweet sauce.

By Table & Traditions Editors

Published September 9, 2026

Overhead view of a round terracotta dish of Senegalese chicken yassa on a dark wooden table — four charred bone-in drumsticks and thighs arranged around a heap of glossy golden braised onion strands studded with green olives and a whole red chilli, with a slate plate of whole and cut lemons, a bowl of pale broken rice and a small dish of sliced red onion alongside a rumpled linen cloth in warm side light.

Yassa comes from the Casamance, the green strip of southern Senegal cut off from the rest of the country by the Gambia, and it is claimed with equal warmth on both sides of that border and in Guinea-Bissau. The word itself carries the region's layered history: in Wolof it has come to mean, plainly, cooking with onions, while the likeliest root is the Portuguese *assar*, to roast, arriving through the Luso-African creole of the Casamance ports centuries before the French did. The Dijon mustard that most cooks now consider non-negotiable is the newest layer, a colonial-era arrival folded so completely into the dish that it no longer reads as foreign. Yassa is not a single recipe but a method — the same lemon-and-onion treatment is given to fish (*yassa jën*), lamb and guinea fowl.

Yield
Serves 6
Prep
30 min, plus 8–24 hours marinating
Cook
1 hr 15 min
Total
About 1 hr 45 min active, spread over 2 days
Difficulty
Intermediate

Chicken yassa is what happens when you take more onion than chicken, drown it overnight in lemon juice and mustard, put the bird over live coals, and then cook the whole lot back down together. It comes from the Casamance, the green, rice-growing strip of southern Senegal that the Gambia nearly severs from the rest of the country, and it is cooked with equal conviction in the Gambia and Guinea-Bissau. Sour, sweet, smoky and faintly hot all at once, it is — after jollof — the West African dish most likely to have travelled to a table outside the region.

A name with three languages in it

The word yassa is a small map of the Casamance’s history. In Wolof it is now taken to mean, straightforwardly, cooking with onions, which is a fair description of the result. But the likelier root is the Portuguese assar, to roast, carried into the region’s creole through the Luso-African trading settlements that predated French rule on this coast by centuries. And the Dijon mustard that nearly every cook now considers non-negotiable is the most recent arrival, a French colonial ingredient so thoroughly absorbed that no one thinks of it as borrowed.

Yassa is best understood not as one recipe but as a treatment. The same lemon-and-onion method is given to fish as yassa jën along the coast, to lamb as yassa yapp, and to guinea fowl for a celebration. The chicken version is simply the one that travelled.

The onions are not a garnish

The number that stops people is the onion weight: roughly 1.2 kg of onion to 1.5 kg of chicken. It is not a typo and it should not be reduced. There is no tomato base here, no cream, no thickener — the onions are the sauce, and they reduce to about a quarter of their raw bulk by the time they are done.

Two things get them there. First, salting and rubbing them the night before, which pulls out water and starts collapsing them before they ever meet heat. Second, a genuinely slow half hour in the pot after they are lifted out of the marinade and drained. That draining matters: onions dumped in still swimming in liquid will boil, stay sulphurous and never develop the sweetness that has to balance three-quarters of a cup of lemon juice.

Char it, then braise it

The chicken goes over charcoal or under a hot broiler until it is blistered and blackened in patches — and deliberately not cooked through. This is the assar the name remembers. Smoke and hard browning are flavour ingredients, and since the chicken then spends half an hour in simmering sauce, pulling it early costs nothing.

Two details protect that work. Wipe every shred of onion off the pieces before they go near the fire, or those shreds carbonise and turn the finished sauce bitter — the most common yassa failure by a distance. And when the chicken goes back into the pot, keep it only two-thirds submerged, so the charred skin sits in steam rather than liquid and survives the braise.

The last spoonful of mustard

Hold back a tablespoon of Dijon and stir it in off the heat, at the very end. Mustard’s pungency is volatile and cooks away; everything that went in at the start has long since mellowed into background savouriness. That final raw spoonful is what makes the difference between a yassa that tastes bright and one that tastes merely long-cooked. Taste at that moment and steer it: sour first, sweet underneath, salty enough to demand rice.

Serve it over broken rice if you can find it, in one wide bowl in the middle of the table. For more of the West African thread running through this collection, try Senegal’s thieboudienne — the rice dish jollof descends from — or Ghana’s waakye, and there’s more on dishes worth crossing a border for in the world classics guide.

Ingredients

Serves
6

For the marinade

  • 1.5 kg (3 1/4 lb) bone-in, skin-on chicken thighs and drumsticks A jointed whole chicken is the Casamance default. Dark meat is strongly preferred — it survives the double cook of fire then braise, where breast dries out. If you must use breast, add it for only the last 15 minutes of the braise.
  • 1.2 kg (about 6 very large) onions, halved and sliced into thin half-moons Yes, that is close to the weight of the chicken. Yassa is an onion dish with chicken in it, not the reverse — the onions collapse to roughly a quarter of their raw volume. Yellow or white; red onions turn the sauce a muddy purple.
  • 180 ml (3/4 cup) lemon or lime juice, freshly squeezed About 4 lemons or 8 limes. Senegalese kitchens use whichever citrus is on the tree; limes give a sharper, more floral sourness. Bottled juice tastes flat and slightly bitter here, where acid is the whole point.
  • 3 tbsp Dijon mustard A colonial import that has become essential. Dijon rather than wholegrain or yellow — it carries heat and emulsifies into the sauce instead of sitting on top as seeds.
  • 6 cloves garlic, crushed to a paste with a little salt
  • 1 tbsp fresh ginger, finely grated
  • 1 Scotch bonnet or habanero chilli Left whole and unpierced for perfume without fire; pierced once or chopped if you want the heat. Traditionally it goes in whole and whoever wants it bursts it on their own plate.
  • 60 ml (1/4 cup) groundnut (peanut) oil Groundnut oil is the everyday Senegalese fat and the peanut is the country's historic cash crop. Any neutral oil works.
  • 2 bay leaves
  • 2 tsp fine salt, plus more to taste
  • 1 tsp coarsely cracked black pepper

For the braise

  • 2 tbsp groundnut oil, for the pot
  • 1 chicken or vegetable stock cube, crumbled — or 250 ml (1 cup) light chicken stock A crumbled bouillon cube is genuinely how this is made in Senegal, not a shortcut. If you'd rather not, use real stock and add salt to taste.
  • 1 tbsp Dijon mustard, to finish Held back and stirred in at the end, off the heat — see step 8.
  • 80 g (1/2 cup) green olives, pitted — optional Common in Dakar restaurant versions and in the Gambia, rarer in village Casamance kitchens. They add a salty, resinous note that plays well against the lemon.
  • 1 carrot, cut into thick coins — optional

To serve

  • 500 g (2 1/2 cups) broken rice (*riz brisé*), steamed Senegal's grain of choice: rice milled to fragments, which drinks sauce far better than whole long-grain. Sold as *riz brisé* or broken jasmine at African and Asian grocers. Plain long-grain is the obvious stand-in.
  • 1 lemon, cut into wedges

Method

Tap a step’s number to check it off as you go.

  1. The day before: put the sliced onions in your largest bowl and rub them hard with the salt for a minute, until they slacken and start to weep.

    Why: Salting and bruising the onions first draws water out and begins breaking down the cell walls, so they hit the pot already half-softened. It is also the only way 1.2 kg of raw onion will fit in a bowl you own.

  2. Add the lemon juice, 3 tbsp Dijon, garlic, ginger, oil, bay, pepper and the whole chilli. Mix thoroughly, then bury the chicken pieces in the onions so every surface is coated and submerged. Cover and refrigerate 8–24 hours, turning once if you remember.

    Why: The overnight sit is doing two separate jobs. The acid and mustard tenderise and season the chicken to the bone, and — just as importantly — the onions are pickling into a sharp, wet mass that will later become the sauce. A two-hour marinade gives you a decent dinner; overnight gives you yassa.

  3. Lift the chicken out and wipe most of the onion off each piece back into the bowl. Pat the skin genuinely dry with kitchen paper. Reserve the onions and every drop of marinade.

    Why: Wet chicken steams instead of browning, and stray onion shreds burn to carbon and turn the whole sauce bitter. This is the fussiest minute in the recipe and it decides how the finished dish tastes.

  4. Grill the chicken over hot charcoal, or under a hot broiler about 15 cm from the element, 5–7 minutes a side — until the skin is blistered and patched with black in places. It should be well coloured but nowhere near cooked through.

    Why: This is the *assar* the name remembers: the char is a flavour ingredient, not a cooking stage. Smoke and Maillard browning give the finished braise its dark, savoury backbone, and because the chicken finishes in liquid there is no risk in pulling it early. Charcoal is better than the broiler, and both are better than a pan.

  5. Meanwhile, heat 2 tbsp oil in a wide heavy pot over medium heat. Tip in the reserved onions — leaving the liquid marinade behind in the bowl for now — and cook, stirring often, for 25–30 minutes, until they have collapsed to about a quarter of their bulk and turned soft, glossy and pale gold.

    Why: Draining the onions before they go in is what lets them actually fry rather than boil. Half an hour sounds excessive for onions; it is not. This is where the sweetness comes from that balances all that lemon, and rushing it on high heat gives you scorched edges around a raw, sulphurous middle.

  6. Pour in the reserved marinade liquid with the bay and chilli, add the crumbled stock cube (or stock) and the carrot if using, and simmer briskly for 8–10 minutes.

    Why: Raw mustard and raw lemon juice both taste harsh and one-dimensional. A few minutes of open-pot simmering blows off the rawest edge of the acid and concentrates what's left, turning it from sour into tangy.

  7. Nestle the charred chicken and any resting juices into the onions, adding water if needed so the pieces are about two-thirds submerged. Cover and simmer gently for 25–30 minutes, until the chicken is tender and pulling from the bone, adding the olives for the final 10 minutes.

    Why: Two-thirds submerged, not drowned: the exposed skin stays in contact with steam rather than liquid, so it doesn't turn to wet rag and the char you worked for survives. A bare simmer, not a boil — hard bubbling shreds the meat and clouds the sauce.

  8. Uncover, lift the chicken onto a plate, and reduce the sauce over medium-high heat for 5–10 minutes until it is thick and jammy and a spoon dragged through leaves a trail. Take it off the heat, stir in the last tablespoon of Dijon, then taste — it should be sour first, sweet underneath, and salty enough to want rice. Adjust with salt, a squeeze of lemon or a pinch of sugar.

    Why: The final mustard goes in off the heat because prolonged cooking dulls its volatile pungency. That raw spoonful at the end is what makes a good yassa taste bright rather than merely long-cooked — the same logic as finishing a dish with fresh herbs.

  9. Return the chicken to the pot, spoon the onions over it and let everything sit 5 minutes. Serve over broken rice with lemon wedges and the whole chilli offered on the side for the brave.

    Why: The short rest lets the meat reabsorb juice and the sauce cling instead of sliding off. In Casamance this goes into one wide communal bowl, rice underneath, chicken and onions heaped in the middle, and everyone eats from the wedge in front of them.

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Variations

  • Yassa jën (fish yassa)

    The coastal version, and arguably the original: thick steaks of firm fish — capitaine (Nile perch), grouper, kingfish or swordfish — marinated for only 30–60 minutes, since acid begins to cure fish rather than tenderise it. Grill or shallow-fry, then lay the fish on the finished onions to warm through for 5 minutes rather than braising it.

  • Yassa lamb or guinea fowl

    *Yassa yapp* uses lamb shoulder cut into chunks and needs a longer braise, 45–60 minutes. Guinea fowl (*pintade*) is the celebration bird across Casamance — treat it exactly as the chicken but expect firmer, gamier meat and add 10 minutes.

  • Vegetarian yassa

    The onion sauce carries the dish, so it works without meat. Use thick planks of firm tofu or halved king oyster mushrooms, or roasted cauliflower steaks and chunks of sweet potato; char them under the broiler, marinate 2 hours only, and fold them in for the last 10 minutes so they don't disintegrate.

  • Weeknight, no marinade

    Not traditional, but honest: rub the chicken with salt, mustard and lemon zest, sear it in the pot, remove, and build the onion sauce in the same pan with the full quantity of lemon juice. You lose the depth of the overnight cure and gain a two-hour dinner.

  • Gambian style, with the olives and the extra chilli

    Across the border in the Gambia, *yassa chicken* often leans sweeter and hotter at once — a spoonful of sugar in the sauce, a whole habanero chopped rather than left whole, and a generous handful of green olives. Served with plain rice and a pile of fresh lettuce and tomato alongside.

Serving & Storage

One wide bowl in the middle of the table, broken rice underneath and the chicken and onions heaped over it, with lemon wedges and the reserved chilli on the side. A dish of cool sliced tomato, cucumber and raw onion in vinegar cuts the richness the way it does across Senegal. Braised hibiscus or bissap leaves are the traditional green; wilted spinach with a squeeze of lemon is a fair substitute.

Pairs with: Broken rice (riz brisé), Attiéké (fermented cassava couscous), Fried sweet plantain, Bissap (hibiscus cooler), Ginger juice (gnamakoudji), Sliced tomato and onion salad.

Storage: Yassa is better on day two — the onions keep melting into the sauce and the lemon settles down. Refrigerate up to 4 days in a sealed container and reheat gently on the stove with a splash of water, since the sauce thickens as it cools. It freezes well for 3 months; freeze chicken and sauce together, thaw overnight in the fridge, and brighten the reheated sauce with a fresh squeeze of lemon and a little mustard, both of which fade in the freezer. The marinating chicken itself should not sit longer than 24 hours — past that the acid starts turning the surface of the meat chalky.

Nutrition

Per serving (1 serving with rice)

Calories
620
Protein
38 g
Carbs
56 g
Fat
26 g
Fiber
5 g
Sugar
12 g
Sodium
980 mg

Notable micronutrients: Vitamin C, Vitamin B6, Niacin, Selenium, Potassium

Estimated using standard ingredient data. Values vary with brands and substitutions.

Frequently Asked Questions

Is that really the right amount of onion?

It is, and it is the single most common reason a home yassa tastes thin. The name is understood in Wolof to mean cooking with onions, and the onions are the sauce — there is no tomato, no cream, no flour doing structural work here. Raw, 1.2 kg looks absurd in the bowl; after salting, marinating and half an hour in the pot it reduces to roughly a quarter of its volume and about two generous cupfuls of jammy sauce for six people. If you halve the onions to be sensible, you get lemony chicken in a puddle instead of yassa.

Do I have to grill the chicken first, or can I just brown it in the pot?

You can brown it in the pot and you will eat well, but you will be making something else. The char is the dish's oldest layer — the likeliest root of the word *yassa* is the Portuguese *assar*, to roast — and open fire contributes smoke compounds and deep Maillard browning that a covered pan cannot. A broiler set high gets you most of the way there; a very hot cast-iron pan gets you perhaps half. If you have charcoal, use charcoal, and don't cook the chicken through: it is going into liquid for another half hour.

Lemon or lime, and can I use bottled juice?

Either citrus is authentic — Senegalese cooks use what is ripe and to hand, and limes are common in the Casamance. Limes are sharper and more perfumed, lemons rounder and slightly sweeter, so lime yassa tastes more aggressive and lemon yassa more mellow. Bottled juice is the one thing to avoid. It has been heat-treated and preserved, which strips the volatile citrus oils that survive into the finished sauce and leaves a flat, faintly metallic sourness that is very noticeable in a dish this acid-forward.

My sauce came out bitter. What went wrong?

Almost always one of three things. Onion shreds left clinging to the chicken carbonised under the grill and went back into the pot — wipe the pieces clean before they see fire. Or the onions were cooked too hot at the start, scorching rather than sweating. Or the citrus pith got in: squeeze the lemons, don't grate or blitz them whole. A bitter sauce can usually be partly rescued with a teaspoon of sugar and a little more salt, but the fix is in the technique, not the seasoning.

Can I make it ahead for a party?

It is close to an ideal make-ahead dish, and Senegalese households treat it as one. Marinate the day before as written, then cook the whole thing through, cool and refrigerate; reheat gently the next day with a splash of water and finish with the reserved spoonful of mustard and a fresh squeeze of lemon just before serving. The onions improve overnight. Only the rice should be cooked fresh — broken rice reheats poorly and turns pasty.

What is broken rice and does it matter?

*Riz brisé* is exactly what it sounds like: rice grains fractured during milling, historically the cheap by-product that colonial trade routed into Senegal in enormous quantity from Indochina and that the Senegalese kitchen then made its own. The short fragments cook faster, sit looser and soak up sauce far more thoroughly than whole grains, which is why every rice-and-sauce dish in the country expects it. Any long-grain rice will carry the yassa perfectly well, but if you can find broken rice at an African or Asian grocer, the dish eats noticeably closer to how it does in Dakar.

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