Because banana flesh oxidizes when exposed to air, don't peel it until you're ready to eat or cook it. If you peel it ahead of time, it has a subtle lemon flavor. Plantains peel more smoothly after blanching in boiling salted water for 5 minutes. to keep banana you can freez it : In Freezer : remove the skin and freeze it whole, in pieces or mashed. Sprinkle with lemon juice right out of the freezer to prevent it from oxidizing. In Room temperature : as the banana turns black on contact with the cold, it is recommended to store it at room temperature, in a fruit bowl or on the counter. To hasten the ripening of green bananas, they are placed in a brown paper bag;