Preparation of soup: Make sweat onion, shallot and garlic(toast foie gras). Slice thinly and add the pork rind and the sheet of bay-tree. Add marrow and the seasoning and make sweat. Pour the white zone and cook 25 mn. Preparation of mushrooms: Clean and wash mushrooms, make jump them to the olive oil. Make return water to mushrooms before draining them. Poêlez again with butter, shallot and chopped garlic.