=Mussels au Gratin.=--Remove and clean the mussels, straining all the liquor thoroughly. Then make this sauce: Fry two tablespoonfuls of chopped onions in butter for a few minutes, but do not let them brown; add about a teaspoonful of flour, and, while the onions are blending, add the liquor of the mussels, stirring it in slowly. Cook this mixture for a few minutes; then add a tablespoonful of vinegar, the same quantity of chopped parsley and pepper and salt to taste. Butter a shallow earthen or wooden baking dish; in the bottom spread a layer of the sauce, lay the mussels on top of it and cover them with the balance of the sauce. Over all this spread a thin coating of breadcrumbs; butter and bake in bag until they have browned. Serve in the same dish in which they were baked. =Boxed Oysters (Virginia Style).=--Take crusty rolls, cut off the top and scoop out the hearts leaving them each like a box. Fill the space with oysters, seasoning with salt, pepper and butter and sprinkling over them some of the crumb of the roll that you have removed. Put bits of butter on top, then replace the cover. Set the rolls in the buttered bag and pour the strained oyster liquor over them. Put into a hot oven and bake for fifteen minutes. Serve hot. Lemon juice or a little mace is sometimes used for seasoning the oysters. =Spindled Oysters and Bacon.=--For two dozen large oysters have two dozen thin slices bacon, and a half dozen slices crisp toast. Have ready a half dozen slender steel skewers. Fill these skewers with alternate slices of bacon and oysters, running the skewer crosswise through the eye of the oyster and threading the bacon by one corner, so that each slice blankets an oyster. Do not crowd. Lay the skewers in a buttered bag, and cook in a quick oven ten minutes. Lay each spindle with its contents undisturbed on a slice of toast, pour the drip from the bag over them and serve at once. CHAPTER VII. FISH. =Filet of Bass.=--WASH and wipe the filets dry with a clean towel, trimming away the fins with a pair of large scissors close to the filet. Dust with salt and lay in a covered dish with a minced onion, the juice of half a lemon and a bit of finely cut parsley and thyme. Let them stand half an hour. Twenty minutes before serving wipe dry again, dust lightly with flour, dip in well-beaten egg, then roll in fine bread crumbs. When all are prepared, put in greased bag and cook twenty minutes until a delicate brown. Arrange on a warm dish and serve with parsley and lemon or sauce tartare. Filets of sole may be cooked in the same way. =Baked Blue Fish.=--Clean thoroughly, cut off head and tail and fill with a soft bread stuffing. Tie up securely, rub over the outside of the fish with sweet vegetable oil, sprinkle with salt and pepper, add a squeeze of lemon juice and slip into the greased bag. Seal and cook from twenty to forty minutes according to weight. Serve with sliced lemon rolled in fine cut parsley.