Cook 2 cups of white dried beans with salt and pepper until very soft; press through a colander. Fry 1 onion in 2 tablespoonfuls of butter until brown; mix with the beans. Add 1 tablespoonful of vinegar, 1 teaspoonful of made mustard, some lemon-juice and 2 tablespoonfuls of molasses. Let all get very hot and serve with pork roast.