Finely chopped onion fry in olive oil until yellow, add the butter and flour, Fry is, pour the wine and broth, add the tomato puree, stir well and boil a little. Add pre-soaked in cold water and finely chopped dried mushrooms, sardines, pepper, salt, boiled for 10 minutes and the mixture is compressed. Portions are placed in a baking dish, pour the prepared mixture and bake until soft. The fish is removed, place it in a warm place, add lemon juice, boil the sauce for 2-3 minutes and pour the fish.