Take four veal sweetbreads, soak them for an hour in cold salted water, first removing the pipes and membranes; then put them into boiling salted water with a tablespoonful of vinegar, and cook them twenty minutes, then drop them again into cold water to harden.
Now remove them, chop them very fine, almost to a paste. Season with salt, pepper and a teaspoonful of grated onion; add the beaten yolks of three raw eggs, one tablespoonful of butter, half a cupful of cream, and sufficient fine cracker crumbs to make stiff enough to roll out into little balls or cork-shaped croquettes. Have ready a frying kettle half full of fat over the fire, a dish containing three smoothly beaten eggs, a large platter of cracker dust; wet the hands with cold water and make the mixture in shape; afterwards rolling them in the cracker dust, then into the beaten egg, and again in the cracker dust; smooth them on the outside and drop them carefully in the hot fat.
When the croquettes are fried a nice golden brown, put them on a brown paper a moment to free them from grease. Serve hot with sliced lemon or parsley.
There are two in a calf, which are considered delicacies. Select the largest. The color should be clear and a shade darker than the fat. Before cooking in any manner let them lie for half an hour in tepid water; then throw into hot water to whiten and harden, after which draw off the outer casing, remove the little pipes, and cut into thin slices. They should always be thoroughly cooked.
After preparing them as above they are put into hot fat and butter, and fried the same as lamb chops, also broiled the same, first rolling them in egg and cracker crumbs.
Three sweetbreads, egg and bread crumbs, oiled butter, three slices of toast, brown gravy.
Choose large, white sweetbreads, put them into warm water to draw out the blood, and to improve their color; let them remain for rather more than one hour; then put them into boiling water, and allow them to simmer for about ten minutes which renders them firm. Take them up, drain them, brush over the egg, sprinkle with bread crumbs; dip them in egg again, and then into more bread crumbs. Drop on them a little oiled butter, and put the sweetbreads into a moderately heated oven, and let them bake for nearly three-quarters of an hour. Make three pieces of toast; place the sweetbreads on the toast, and pour round, but not over, them a good brown gravy.
If they are uncooked, cut into thin slices, let them simmer in a rich gravy for three-quarters of an hour, add a well-beaten egg, two table-spoonfuls of cream and a tablespoonful of chopped parsley; stir all together for a few minutes and serve immediately.