Line the pan with tin foil. Brush 1/2 tablespoon of coconut oil on the tin foil lining the bottom of the pan. Place fish into pan and coat the top with the second 1/2 tablespoon.
Sprinkle 1-2 teaspoon of herb seasoning on the top of the fillet. After this cut your lemon into slices about 1/4 inch thick.
Place lemon slices on top of the fillet, and put in the oven. Bake for about 15 minutes, or until fish feels firm.