Boiled: Peel and boil matooke bananas (unripened bananas) in salted water (like potatoes) until tender. Drain water and eat with butter.
Steamed: Wrap matooke in banana leaves and tie at top. Line a saucepan with strips of banana leaves or stalks. Put in water, about 1/2 full and place wrapped matooke on top of the leaves. Be sure enough water is available to cover the matooke leaves. Cover the top of the saucepan and steam until cooked, about 2 to 3 hours. Unwrap matooke and allow some steam to escape. Mash matooke with hands by kneading the banana leaves wrapped around the matooke. Do this in a separate dish is there is still water left over from steaming.