Slow-Simmered Senegalese Fish Yassa with Lemon and Onions

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A traditional West African dish featuring tender fish marinated in a tangy lemon and onion sauce, slow-cooked to develop deep, vibrant flavors. This african-inspired seafood ready in about 105 minutes pairs fresh lemon juice, medium yellow onions, thinly sliced, garlic cloves, minced for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 70 min Cook: 35 min Serves 4 African cuisine 320 cal/serving
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Ingredients

Instructions

  1. Step 1: In a large bowl, combine 1/2 cup fresh lemon juice, 3 thinly sliced yellow onions, 4 minced garlic cloves, 2 tbsp Dijon mustard, 1 tsp dried chili flakes, 1/2 tsp black pepper, and 1 1/2 tsp salt. Add the 2 pounds of fish pieces and toss gently to coat. Marinate for at least 1 hour in the refrigerator.
  2. Step 2: Heat 4 tbsp vegetable oil in a large skillet over medium heat. Remove the fish from the marinade, reserving the onions and liquid. Sear the fish pieces for 3 minutes on each side until lightly browned but not fully cooked, then transfer to a plate.
  3. Step 3: In the same skillet, add the reserved onions and marinade liquid along with 1 cup water. Cook over medium heat, stirring occasionally, until the onions are soft and fragrant, about 10 minutes.
  4. Step 4: Gently nestle the seared fish pieces back into the skillet, cover, and reduce heat to low. Simmer for 15-20 minutes until the fish is cooked through and the sauce thickens slightly.
  5. Step 5: Sprinkle 2 tbsp chopped fresh parsley over the dish before serving. Serve with steamed rice or couscous to soak up the vibrant sauce.

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Frequently asked questions

How long does Slow-Simmered Senegalese Fish Yassa with Lemon and Onions take to make?

Total time is about 105 minutes (70 min prep + 35 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Slow-Simmered Senegalese Fish Yassa with Lemon and Onions?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep fresh lemon juice from drying out.

Can I substitute ingredients in Slow-Simmered Senegalese Fish Yassa with Lemon and Onions?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Slow-Simmered Senegalese Fish Yassa with Lemon and Onions for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Slow-Simmered Senegalese Fish Yassa with Lemon and Onions?

African seafood like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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