
Seafood gratin is my answer when I want to serve something elegant and comforting that never fails to impress. Brimming with juicy shrimp and scallops nestled in a creamy sauce and crowned with bubbling golden cheese this dish is pure French-inspired comfort food but quick enough for a weeknight.
I first made this for a last-minute dinner party and was amazed how it disappeared from the table faster than anything else I served. Even my pickiest eater came back for seconds.
Ingredients
- Shrimp: peeled and deveined brings sweetness and a tender bite look for seafood that smells fresh and is firm to the touch
- Scallops: fresh or well-thawed if frozen these add delicate flavor and richness select scallops that are dry-packed for best texture
- Butter: gives the sauce its silky base use a good quality unsalted butter for a clean creamy flavor
- Onion: chopped adds subtle sweetness and depth of flavor choose onions that are firm and have shiny skins
- Garlic: minced brings warmth and complexity pick plump cloves for best taste
- Heavy cream: creates a lush sauce for real French flair find a cream with a high fat content for richness
- White grape juice: offers a gentle sweetness balancing the flavors try to use pure juice without added sugar
- Grated cheese for topping: any good melting cheese works I love Gruyere for nutty notes but use your favorite try to grate it yourself for best melting results
- Salt: to taste heightens every flavor fine sea salt gives even seasoning
- Black pepper: freshly ground adds a mild kick grind just before cooking for the brightest flavor
Step-by-Step Instructions
- Prepare the Seafood:
- Pat the shrimp and scallops dry after rinsing to ensure they sear not steam in the pan then set aside
- Sauté the Aromatics:
- In a large skillet melt the butter over medium heat add chopped onion and garlic cook gently for about three to four minutes until they are soft and translucent the onions should be fragrant but not browned
- Cook the Seafood:
- Add the shrimp and scallops to the pan spread them out in a single layer cook for about three minutes turning once shrimp should be just pink and scallops opaque to avoid overcooking which can make seafood tough
- Build the Sauce:
- Pour in the white grape juice let it simmer for two minutes to concentrate the flavors then add heavy cream salt and black pepper stir everything together and let it heat through until slightly thickened do not let the sauce boil hard or the cream can split
- Assemble and Top:
- Spoon the creamy seafood mixture into a baking dish as evenly as possible sprinkle the grated cheese thickly over the top for a golden crust
- Bake to Perfection:
- Bake in a preheated oven at 180 Celsius or 350 Fahrenheit for about fifteen minutes until the cheese bubbles and turns deeply golden
- Rest and Serve:
- Remove the gratin and let it sit for a few minutes before serving this helps the flavors settle and makes scooping easier

I have a fondness for how the cheese on top melds into the cream beneath It reminds me of cozy winter dinners by the fireplace in my childhood kitchen when my mom would experiment with borrowed French recipes
Storage tips
Seafood gratin keeps well in the refrigerator for up to two days Make sure to cool it fully before covering tightly and storing Reheat gently in the oven at a low temperature until warmed through to keep the sauce smooth
Ingredient substitutions
If shrimp or scallops are unavailable try using firm white fish chunks such as cod or haddock Mussels can also make an exciting addition For the creamy component coconut cream can be used for a dairy-free twist
Serving suggestions
This gratin pairs beautifully with crusty bread that can soak up extra sauce A crisp green salad with lemon vinaigrette balances the richness or serve over steamed rice for a heartier meal

Cultural historical context
Seafood gratins come from coastal French regions where fresh catch meets rustic home cooking French cooks are masters at transforming humble ingredients into showstopping comfort food and this recipe channels those traditions
Recipe FAQs
- → Which seafood can I use as substitutes?
Besides shrimp and scallops, try firm white fish or crab meat for great results. Adjust cooking times as needed to avoid overcooking.
- → Can I prepare the gratin ahead?
Yes, assemble the dish up to the baking stage and refrigerate. Bake just before serving for the best flavor and texture.
- → What cheese works best for topping?
A blend of Gruyère and Parmesan gives great flavor, but you can use your favorite melting cheese such as mozzarella or cheddar.
- → Is heavy cream essential?
Heavy cream creates a rich sauce, but half-and-half can be used for a lighter version. Avoid low-fat cream to maintain texture.
- → How do I prevent the seafood from overcooking?
Sauté shrimp and scallops just until opaque. They will finish cooking during baking, remaining tender and juicy.