The fish is cleaned and Wash. Season with pepper and salt it. One lemon cut into slices and put in her abdominal cavity. Place in a baking dish and pour the mixture of equal parts of water, vinegar and sunflower oil (or olive oil). On its surface ranks second lemon, also sliced. Allow to cool for two hours and then baked in a preheated 180 C oven until ready (about 40 minutes).