Poulet Yassa is one of those chicken dishes where the sauce does most of the talking. The chicken is marinated with lemon, mustard, garlic, ginger and chili, then cooked with a lot of onions until the sauce becomes sharp, savory, slightly sweet and glossy. I make it when I want something hearty but not creamy, with enough sauce to spoon over rice.

This recipe is based on my YouTube video, with a few adjustments since publication. I increased the onions, clarified the salt, gave the stock a real measurement, and cleaned up the cooking times so the recipe is easier to repeat in a home kitchen in Canada or the United States. The spirit stays the same: well-seasoned chicken, onions cooked down until soft, and a short sauce that tastes like lemon, mustard and roasted pan juices.

I make it this way because chicken thighs can take a strong marinade without drying out. The mistake to avoid is rushing the onions. If they are still crunchy and white when everything goes into the oven, the sauce will taste raw. What I look for here is a pan of onions that has softened, lost its harsh bite, and started to smell sweet before the chicken finishes cooking.

This is different from my creamier chicken recipes. If you want something rich and mild, try my Dijon cream chicken thighs. If you want a grilled chicken with more char and less sauce, my Greek-style grilled chicken thighs or grilled piri piri chicken make more sense. This one is for onion sauce, lemon, mustard, and rice.

Easy Poulet Yassa with Lemon, Mustard and Caramelized Onions

What Makes This Version Work

The balance matters. Lemon gives the dish its brightness, but too much lemon with not enough onion can make the sauce taste thin and sour. Mustard gives body and a little heat, but it should not take over. The onions are what round everything out.

I prefer to marinate the chicken for at least one hour, but not all day with this much lemon. A long acidic marinade can change the surface texture of the meat. For more detail on timing and seasoning, my guide to how to marinate chicken properly is useful, especially for thighs and drumsticks.

Bone-in, skin-on thighs are my first choice. They stay juicy, they brown nicely, and they give the sauce more flavor. Boneless thighs work too, but they cook faster and need a little less time in the oven. If you are comparing cuts, my guide to chicken breasts, thighs and drumsticks explains why thighs are so forgiving for saucy recipes like this.

Ingredients You Need

Use chicken thighs, onions, lemon juice, Dijon mustard, garlic, ginger, chili, oil, stock, olives, green onions and parsley.

The onions are not just a garnish. They are the sauce. Four large onions may look like too much at first, but once they soften and reduce, the amount makes sense. At the beginning, the pan will look crowded. After a few minutes, the onions will collapse, release moisture, and turn glossy.

For the liquid, I like a small amount of chicken stock. Not a soup. Not a stew. Just enough to help the onions and marinade become a spoonable sauce. Homemade stock is great, and even a small cube-style base works. If you make your own, this homemade chicken bouillon cube recipe is a practical base to keep around.

Olives are optional, but I like them here. They add salt and a little bitterness that works well with the lemon. Add them near the oven stage so they warm through without dominating the sauce.

Step-by-Step Instructions

Start with the marinade. In a large bowl, mix fresh lemon juice, Dijon mustard, minced garlic, ginger, chili, salt, black pepper and a little oil. It should smell sharp right away. Add the chicken thighs and turn them until every piece is coated. I prefer to place the chicken skin-side up but make sure the flesh side gets plenty of contact with the marinade. The skin does not absorb flavor the same way the meat does.

Add the sliced onions to the bowl and toss everything together. Cover and refrigerate for at least one hour. If you have three hours, even better. Do not throw away the onions or marinade because they become part of the cooked sauce.

When it is time to cook, remove the chicken from the marinade and scrape off some of the onions so the chicken can brown. Heat oil in a large skillet over medium-high heat. The pan should be hot enough that the chicken sizzles as soon as it touches the surface. Brown the thighs on both sides. You are not trying to cook them fully yet. You want color, rendered fat, and those browned bits in the pan.

In another pan, or in the same pan after removing the chicken, cook the onions. They will release a lot of liquid at first. Let that moisture cook down. Stir often, scraping the bottom so the mustard and lemon do not burn. You know the onions are ready when they are soft, shiny, lightly golden in spots, and no longer smell raw.

Combine the browned chicken, cooked onions, remaining marinade, stock, olives, thyme and bay leaf in a large oven-safe pan or baking dish. The sauce should come partway up the chicken, not cover it. If the chicken is swimming, there is too much liquid. If the pan looks dry before it goes into the oven, add another small splash of stock.

Bake uncovered until the chicken is fully cooked and the sauce has reduced. For safe doneness, check the thickest part of the chicken with a thermometer. My chicken internal temperature guide is helpful here. The minimum safe internal temperature is 165°F, but thighs are often better a little higher because the texture becomes more tender.

At the end, the sauce should look glossy and spoonable. If it is too thin, reduce it for a few minutes on the stovetop. If sauce texture is something you struggle with, the guide on how to thicken a sauce without ruining it is a good reference. For this recipe, reduction is usually enough. No flour, no cream.

Finish with sliced green onions and chopped parsley. Add them at the end so they stay fresh and green. Serve with plain white rice so the sauce has somewhere to go.

How This Recipe Is Different From Similar Chicken Dishes

This is not a creamy chicken dinner. There is no cream, no cheese, and no heavy sauce. The body comes from cooked onions and mustard.

It is also not a fast 15-minute chicken recipe. The hands-on work is simple, but the marinade and onion cooking matter. If you need a quicker weeknight chicken dinner, try easy mustard chicken or a batch of air fryer chicken thighs.

Compared with maple mustard chicken drumsticks, this recipe is sharper and more onion-forward. Compared with Mediterranean chicken thighs, it is less herb-heavy and more focused on lemon, mustard and onions. Compared with one-pan chicken and rice, the rice here is cooked separately so the sauce stays concentrated.

Substitutions

Chicken thighs are best, but drumsticks work well. If using drumsticks, watch the cooking time and turn them once during baking. You can also use boneless thighs, but reduce the oven time and check early.

Yellow onions can replace white onions. Red onions work too, but they give the sauce a slightly sweeter flavor and darker color.

Dijon mustard is my preference. Yellow mustard is milder and less sharp, so the final sauce will taste different. Grainy mustard can be used for part of the Dijon, but I would not use it for the full amount.

No piment oiseau? Use a pinch of cayenne, crushed chili flakes, or leave it out for a mild version.

Peanut oil works well because it handles heat, but canola oil, avocado oil or vegetable oil are fine.

Green olives can be left out. If using them, taste the sauce before adding extra salt because olives and stock can both be salty.

What to Serve With It

White rice is the classic choice because it catches the onion sauce. Keep it simple. The chicken already has enough acidity and character.

For something fresh on the side, I like a crisp salad with a little bitterness, like a romaine and endive green salad. A crunchy red endive salad also works because it cuts through the richness of the chicken skin and onions.

If you want a bigger dinner, add a chilled side like creamy potato salad or creamy dill pickle potato salad. Those are heavier sides, so I usually serve smaller portions with this chicken.

For more chicken dinner ideas, browse my chicken recipes or the bigger guide to homemade chicken recipes.

Health and Nutrition Notes

This is a hearty chicken dish with plenty of protein from the thighs and a lot of onions in the sauce. It is not a light salad-style dinner, especially if you keep the skin on, but it is not cream-based either.

For a lighter plate, remove the skin after cooking, use a little less oil, and serve it with rice plus a crisp green salad. I would not remove all the fat before cooking because some of that flavor helps the onions and sauce.

FAQ

Can I marinate the chicken overnight?

You can, but I prefer 1 to 3 hours because of the lemon. If marinating overnight, reduce the lemon slightly or add part of the lemon juice closer to cooking.

Can I make this with chicken breasts?

Yes, but thighs are better. Chicken breasts dry out more easily and do not give the sauce the same richness. If using breasts, do not overcook them and check the internal temperature early.

Is Poulet Yassa spicy?

It can be, but it does not have to be. One small chili gives gentle heat. Remove the seeds or skip the chili if you want it mild.

Can I make it ahead?

Yes. It reheats well because the onion sauce keeps the chicken moist. Reheat gently on the stovetop with a splash of stock or water if the sauce has thickened too much.

Why is my sauce too sour?

There may be too much lemon for the amount of chicken and onions. Add more cooked onions if you have them, or simmer the sauce with a small splash of stock. A tiny pinch of sugar can help, but do not turn it sweet.

Why did my onions burn?

The pan was probably too hot after adding the marinade, or there was not enough moisture left. Lower the heat and stir often. The onions should soften and reduce, not fry hard.

Easy Poulet Yassa with Lemon, Mustard and Caramelized Onions

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Prep Time 25

Cooking Time 40

Category Main Dish

Cuisine Senegalese-inspired

Portions 6 portions

Calories 520 kcal

Ingredients

3 lb bone-in skin-on chicken thighs
4 large onions thinly sliced
1/3 to 1/2 cup fresh lemon juice
2 tbsp Dijon mustard
3 garlic cloves minced
1 tbsp fresh ginger minced or cut into fine strips
1 small hot chili minced, optional
2 tsp fine salt plus more to taste
1/2 tsp black pepper
3 tbsp peanut oil or vegetable oil
2/3 cup chicken stock or water
1/3 cup green olives
1 small thyme sprig optional
1 bay leaf optional
2 green onions sliced
2 tbsp chopped fresh parsley
Cooked white rice for serving

Instructions

In a large bowl, mix lemon juice, Dijon mustard, garlic, ginger, chili, salt, pepper and 1 tbsp oil.
Add the chicken thighs and sliced onions. Toss well, cover, and refrigerate for at least 1 hour.
Preheat the oven to 350°F.
Remove the chicken from the marinade, keeping the onions and marinade. Scrape excess onions off the chicken so it browns properly.
Heat 2 tbsp oil in a large skillet over medium-high heat. Brown the chicken on both sides, then transfer to an oven-safe dish or pan.
In the same skillet, cook the onions and marinade over medium heat until the onions are soft, glossy and lightly golden.
Add the cooked onions to the chicken. Pour in the chicken stock. Add olives, thyme and bay leaf.
Bake uncovered for 25 to 30 minutes, or until the chicken reaches at least 165°F internally and the sauce is reduced.
Remove thyme and bay leaf. Stir in green onions and parsley.
Serve hot with white rice and spoon the onion sauce over the top.

Video

Notes

FAQ