Steps
1. Peel bananas and cook until tender. Mash while hot.
2. Heat margarine and onion in a skillet until onions are crystal clear, add the bananas, mixing vey well. Add salt and pepper.
3. Serve hot, accompanied by other foods (meat) or by itsel.

Source
Compa?ia Bananera de Costa Rica, STARGARDTER, F. (ED), All you need is under the peel - green bananas recipes, Golfito