These flathead fillets with yogurt tartare sauce are a delicious and healthy seafood dish. The flathead fillets are coated in a crispy breadcrumb crust and baked until golden and flaky. The yogurt tartare sauce is a refreshing and tangy accompaniment that complements the delicate flavor of the fish. Serve these flathead fillets with a side of roasted vegetables or a fresh salad for a complete and satisfying meal.