Step 1

Gather fresh shrimp and scallops. If using frozen seafood, thaw completely, rinse under cold water, and pat dry.

Step 2

In a large skillet, melt butter over medium heat. Add chopped onion and minced garlic, sauté for 3-4 minutes until translucent.

Step 3

Add shrimp and scallops to the skillet, cooking for about 3 minutes until shrimp turns pink and scallops are opaque.

Step 4

Pour in white grape juice and simmer for 2 minutes. Stir in heavy cream, salt, and black pepper, mixing well.

Step 5

Transfer the seafood mixture into a baking dish and sprinkle grated cheese on top.

Step 6

Preheat the oven to 180°C (350°F). Bake the gratin for about 15 minutes until the cheese is bubbly and golden brown.

Step 7

Remove from the oven and let cool slightly before serving.