In a small bowl, combine the butter, lemon juice, capers, garlic, dill, salt and pepper. Pour the butter mixture over the fish.
6 tablespoons unsalted butter, 3 tablespoons freshly squeezed lemon juice, 2 tablespoons capers, 2 garlic cloves, 1 ½ teaspoons dried dill, ½ teaspoon salt, ¼ teaspoon ground black pepper