Delicious Mexican Dish

Soak and scald a pair of sweetbreads, cut into small bits; take liquor from three dozen large oysters; add to sweetbreads with 3 tablespoons of gravy from the roast beef, and ¼ lb. of butter chopped and rolled in flour; cook until sweetbreads are tender; add oysters; cook 5 minutes; add ¾ cup of cream; serve with or without toast.