Boil the heart and a piece of liver for 1 hour. When cold, mince them both very fine. Toast the oatmeal in the oven and then add this to the minced meat with the chopped onions, a tablespoon of salt and a good sprinkling of black pepper. Mix well, and put it all in a pudding basin. Make a suet crust and cover the basin with it. Boil for 4 hours, and serve it very hot.