Wash the fish, dry it with a napkin.
Pepper inside and out with black pepper and salt.
Grease a baking sheet with vegetable oil and lay out the fish. Sprinkle the fish with thyme, also inside and out. Put the lemon slices in the abdomen. Chili peppers can be taken fresh or dry, ground. Sprinkle the onion around and lay out the apple slices. Carefully pour in the cider.
Sprinkle salt, pepper and thyme on top again. Spread the fish with thin slices of butter.
Preheat the oven to 200 degrees.
Bake for 35 minutes.