The Sauce: Pour oil in a frying pan, add the meat and slices of onions. Cook it until its turn yellow. Add some spices, tomato, beans and 1/2 cups of water. Cook for 2 hrs under low heat. Add some water if necessary. Keep turning the mixture from time to time. Cut the 4 large Onion in thin round sizes and put them in a saucepan under the low heat. Cook it until it turns yellow. Add butter and a little salt, chilli or pepper. Leave it until it cooked. Add the round slices of onions into the sauce and while the sauce is cook, add the cucus and a spoon of oil and salt. Steam it for the period. Serve it with some sauce pour on it.