Classic Fish and Gratin Dauphinois

Method

1. Preheat oven to 375°F (190°C).
2. In a pot, boil potatoes until tender, then mash them.
3. In a separate pan, sauté onion and garlic in butter until soft.
4. Mix mashed potatoes with cream, cheese, and sautéed onions.
5. Transfer to a greased baking dish and bake for 25-30 minutes until golden.
6. Meanwhile, season fish fillets and bake or pan-sear until cooked through.
7. Serve fish with the gratin on the side.
8. Cook fish and seafood to an internal temperature of 63°C (145°F) before serving.