Make it very hot in the oven or under the gas flame, then grease well with vegetable oil, olive or the refined cotton seed, and lay on it the fish cleaned, split down the back, seasoned, oiled all over with the sweetest of vegetable oils or butter and spread out as flat as possible with the skin side next to the hot board. Slip into the greased bag and fasten tightly. If you use the gas oven for planking your fish, as most of us do, turn on both burners until the oven is very hot. Then set in the fish with a trivet under the bag the same as if you were cooking without the plank. Bake from thirty to forty-five minutes, then serve piping hot on the plank which has been taken out of the bag, set on a big japanned tray and garnished with hot mashed potato pressed through a tube in rose fashion at regular intervals, alternating with mounds of peas or carrot dice, sprigs of watercress or parsley and thin slices of lemon rolled in fine minced parsley. Accompany with sauce tartare or parsley butter. =Halibut à la Poulette.=--Take two pounds of halibut, arrange in filets, freeing from skin and bone; then cut into narrow strips. Season with salt, pepper and lemon juice; cut two onions in slices and lay on the filets, then set away for half an hour. At the end of this time have ready one-third cup melted butter or refined vegetable oil. Dip the filets in this, roll, skewer into shape and dredge with flour. Arrange in a well-buttered bag, seal and bake twenty minutes in a moderate oven. Serve with white sauce and two hard boiled eggs, sliced for a garnish. =Herring au Gratin.=--Soak and filet the herring. Butter a bag and strew the bottom with the bread crumbs well-buttered, a layer of grated cheese and a little minced chives or parsley. Sprinkle with pepper and lay in the filets of herring, plain or alternately with sliced tomato. Cover with more crumbs, parsley, cheese and butter, close the bag, and bake fifteen minutes until a good brown. =Herrings With Herbs.=--Take four dried herrings, bone them, fill the cavities with a little (about half a teaspoonful to each fish) finely minced shallot or chives, and parsley. Add a few fresh breadcrumbs and tiny bits of butter. If liked, a tiny grate of nutmeg may be added as well as a good dust of pepper. Put into a well-greased bag and bake in the oven for ten minutes. Dish up and serve as hot as possible. Other dried fish are excellent prepared in the same way.