You will need
Tomatoes , onions and oil
Soak the beans in water for at least 6 hours to a day. This will soften the bean coating for easy peeling. Next, peel and clean the beans. Add salt to taste and boil until they are soft.
In a separate pot, make a sauce from the oil, tomatoes and onions. Mix them with the beans and mash (whilst on low heat) until the mixture is smooth. Serve with nsima.