Spiced Senegalese Fish Yassa with Caramelized Onions and Mustard Sauce

By · Reviewed by AislePrompt Editorial · ·

Fish fillets marinated in a vibrant mustard-lemon sauce, then pan-seared and served atop a bed of slowly caramelized onions packed with Senegalese spices. This african-inspired seafood ready in about 40 minutes blends large yellow onions, thinly sliced, fresh lemon juice, Dijon mustard into a versatile sauce that lifts everything from grain bowls and roasted vegetables to grilled proteins — a small-batch staple worth keeping in the fridge. Each serving lands at about 320 calories and feeds 4, so a small batch covers several meals across the week without taking over the fridge. 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: 10 min Cook: 30 min Serves 4 African cuisine 320 cal/serving
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Ingredients

Instructions

  1. Step 1: In a bowl, whisk together 1/3 cup fresh lemon juice, 3 tbsp Dijon mustard, 3 minced garlic cloves, 1 1/2 tsp salt, 1 tsp black pepper, and 1/2 tsp smoked paprika. Add 4 white fish fillets and coat them thoroughly. Marinate for 30 minutes.
  2. Step 2: Heat 3 tbsp vegetable oil in a large skillet over medium heat. Add 2 large thinly sliced yellow onions and 1 finely chopped scotch bonnet pepper (optional). Cook for 15 minutes, stirring occasionally, until onions are deeply caramelized and soft.
  3. Step 3: Remove onions from skillet and set aside. Add 1 tbsp vegetable oil to the same skillet and heat over medium-high heat. Add marinated fish fillets and sear for 4-5 minutes per side until golden and cooked through.
  4. Step 4: Serve fish fillets on a bed of the caramelized onions, spooning any pan juices over the top for added flavor.

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Frequently asked questions

How long does Spiced Senegalese Fish Yassa with Caramelized Onions and Mustard Sauce take to make?

Total time is about 40 minutes (10 min prep + 30 min cook). A small batch typically covers several meals in the week — store as the recipe directs.

How do I store leftover Spiced Senegalese Fish Yassa with Caramelized Onions and Mustard Sauce?

Transfer to an airtight jar and refrigerate for up to 5–7 days. Most sauces freeze well for up to 2 months — portion into small containers or freezer bags so you can thaw only what you need. Stir before serving; cream- or yogurt-based sauces may separate on standing.

Can I substitute ingredients in Spiced Senegalese Fish Yassa with Caramelized Onions and Mustard Sauce?

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 Spiced Senegalese Fish Yassa with Caramelized Onions and Mustard Sauce 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 Spiced Senegalese Fish Yassa with Caramelized Onions and Mustard Sauce?

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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