There’s something irresistibly comforting about a creamy seafood dish baked until golden and bubbling.
This seafood gratin combines tender seafood with a rich, velvety sauce and a crisp topping.
It’s elegant enough for special occasions yet simple enough for a cozy dinner at home.
Why You’ll Love This Recipe
This dish delivers a luxurious creamy texture paired with perfectly tender seafood.
The golden, crispy topping adds contrast and makes every bite more satisfying.
It’s simple to prepare with everyday ingredients yet feels restaurant-worthy.
You can easily customize the seafood mix based on what you have available.
What You’ll Need (Ingredient Highlights)
Mixed seafood provides a variety of textures and flavors, from tender fish to juicy shrimp.
Heavy cream and milk create a rich, smooth sauce that coats everything beautifully.
Butter and flour form the base of a classic roux for a thick, creamy consistency.
Grated cheese melts into a savory, golden topping with added depth.
Breadcrumbs add a crisp finish that contrasts with the creamy interior.
Pro Tips Before You Start
Pat the seafood completely dry to avoid excess moisture thinning the sauce.
Cook the roux slowly and whisk continuously to prevent lumps.
Do not overcook the seafood before baking, as it will finish in the oven.
Use freshly grated cheese for better melting and flavor.
How to Make Seafood Gratin
Step 1 – Prepare the seafood
Pat the seafood dry with paper towels. Cut fish into bite-sized pieces and season lightly with salt and pepper.
Step 2 – Build the base
Preheat oven to 200°C (400°F). Heat olive oil in a pan, sauté onion until soft, then add garlic and cook until fragrant.
Step 3 – Make the creamy sauce
Add butter and let it melt, then whisk in flour to form a roux. Gradually whisk in milk and cream until smooth and thickened.
Step 4 – Combine seafood and sauce
Fold the seafood gently into the sauce. Season to taste and keep the mixture slightly undercooked.
Step 5 – Add topping
Sprinkle grated cheese evenly over the mixture, followed by breadcrumbs.
Step 6 – Bake
Bake for 20–25 minutes until golden brown on top and bubbling around the edges.
Step 7 – Rest and serve
Let it rest for 5 minutes before serving. Garnish with chopped parsley.
What to Serve Them With
Serve with crusty bread to soak up the creamy sauce.
A light green salad balances the richness of the dish.
Pair with a glass of white wine for an elegant meal.
Variations / Substitutions
Swap seafood with only shrimp or a mix of fish and scallops.
Use Gruyère or Parmesan for a deeper cheese flavor.
Add mushrooms or spinach for extra texture and nutrition.
Storage & Leftovers
Store leftovers in an airtight container in the refrigerator for up to 2 days.
Reheat gently in the oven to maintain the creamy texture.
FAQs
Can I make this recipe ahead of time?
Yes, you can assemble it in advance and bake when ready to serve.
How should I store leftovers?
Keep leftovers in an airtight container in the refrigerator.
Can I freeze this dish?
Freezing is not recommended as the sauce may separate.
Can I substitute some of the ingredients?
Yes, you can adjust the seafood or cheese based on preference.
How long does this recipe take to make?
It typically takes about 40–45 minutes from start to finish.
Is this recipe kid-friendly?
Yes, the creamy texture and mild flavors make it approachable.
Can I make this dish gluten-free or dairy-free?
Yes, use gluten-free flour and dairy-free alternatives.
What should I serve it with?
It pairs well with bread, salad, or light vegetable sides.
Do I need special equipment?
No, just a pan and an oven-safe dish.
How do I know when it’s perfectly cooked?
The top should be golden and the sauce bubbling at the edges.
Final Thoughts
This seafood gratin is rich, comforting, and full of flavor with every bite.
It’s a simple yet elegant dish that works for both everyday meals and special occasions.
Full Recipe Card
Ingredients
400 g mixed seafood
2 tablespoons olive oil
1 small onion, finely chopped
2 garlic cloves, minced
200 ml heavy cream
100 ml milk
50 g butter
2 tablespoons all-purpose flour
100 g grated cheese
50 g breadcrumbs
Salt and freshly ground black pepper
Chopped fresh parsley
Instructions
Preheat oven to 200°C (400°F).
Pat seafood dry and cut into bite-sized pieces. Season lightly.
Heat olive oil and sauté onion until soft, then add garlic.
Melt butter, whisk in flour, then gradually add milk and cream until thickened.
Fold in seafood and season to taste.
Top with grated cheese and breadcrumbs.
Bake 20–25 minutes until golden and bubbling.
Rest 5 minutes and garnish with parsley before serving.
