When it comes to French comfort food, few dishes feel as luxurious and heartwarming as a Gratin de Fruits de Mer. Translating to “seafood gratin”, this dish combines a mix of seafood in a creamy, wine-infused sauce, topped with breadcrumbs and cheese, then baked until bubbly and golden.

It’s a dish that feels elegant enough for special occasions yet comforting enough for a cozy weekend dinner. Think of it as the seafood cousin of gratin dauphinois — indulgent, rich, and irresistible.

🦐 What is Gratin de Fruits de Mer?

Gratin = a dish topped with breadcrumbs, cheese, or both, then baked until golden.

Fruits de Mer = “fruits of the sea” (seafood).

Traditionally, this gratin features a medley of seafood such as shrimp, scallops, mussels, and white fish, bathed in a creamy béchamel or velouté sauce, enriched with wine and cheese. The result is a silky filling with a crunchy top layer.

🛒 Ingredients You’ll Need

For 4 servings:

200 g shrimp (peeled and deveined)

200 g scallops

200 g white fish (like cod or haddock, cut into chunks)

200 g mussels (cleaned, cooked, and shelled)

3 tbsp butter

3 tbsp flour

500 ml milk (warm)

100 ml dry white wine

1 small onion, finely chopped

2 cloves garlic, minced

1 bay leaf

A pinch of nutmeg

50 g grated Gruyère or Parmesan cheese

½ cup breadcrumbs

2 tbsp parsley, chopped

Salt & freshly ground black pepper, to taste

🍳 Step-by-Step Recipe

Step 1: Prepare the Seafood

Lightly season shrimp, scallops, and fish with salt and pepper.

In a skillet, melt a little butter and quickly sauté seafood for 2–3 minutes (do not fully cook).

Remove and set aside.

Step 2: Make the Sauce

In a saucepan, melt 3 tbsp butter. Add onions and garlic, cook until soft.

Stir in flour to make a roux and cook for 1 minute.

Gradually whisk in warm milk and white wine, stirring until smooth.

Add bay leaf, nutmeg, salt, and pepper. Simmer until slightly thickened.

Stir in half of the grated cheese, then remove bay leaf.

Step 3: Assemble the Gratin

Preheat oven to 200°C (400°F).

Place the seafood mix into a buttered baking dish.

Pour the sauce evenly over the seafood.

Mix breadcrumbs with remaining cheese and parsley, then sprinkle on top.

Step 4: Bake to Perfection

Bake for 20–25 minutes, until the top is golden brown and bubbling.

Let rest for 5 minutes before serving.

🌟 Serving Suggestions

Serve with a green salad and fresh baguette to balance the richness.

Pair with steamed rice or buttered pasta for a heartier meal.

Wine pairing: a Chardonnay or Muscadet complements the creamy sauce.

✨ Tips for a Perfect Gratin de Fruits de Mer

Don’t overcook seafood before baking — it will finish cooking in the oven.

Use a mix of seafood for depth of flavor; at least 3 varieties are ideal.

Gruyère cheese is traditional, but Parmesan or Comté also works well.

For extra richness, stir 2 tbsp of cream into the sauce before baking.

🎉 Why You’ll Love This Recipe

It’s luxurious and comforting at the same time.

A great way to showcase a variety of seafood.

The crispy golden crust contrasts perfectly with the creamy filling.

👉 If you’re looking for a dish that’s restaurant-worthy yet homely, Gratin de Fruits de Mer is the perfect French recipe to impress your family or guests.