Heat the fat with the water until the fat melts. Stir the oatmeal with the salt and bicarbonate of soda. Add the liquid and stir well to make a stiff paste. Form into eight balls and squash these flat, pressing more oatmeal into each side. They should be about ⅓in. thick. Cook on both sides on a lightly greased griddle, hotplate or frying pan, or bake at 350°F, 180°C, gas mark 4 for thirty minutes. Eat hot or cold with butter, cheese or marmalade. These may be kept in a tin, or more traditionally buried in oatmeal in a meal-chest. If not freshly-baked, they should be reheated before serving.