Baked bananas with rum 1 cup sugar 1/2 cup fresh lemon juice 1 tablespoon butter 2 tablespoons white rum 6 medium underripe bananas Preheat over to 400F. In a saucepan, mix the sugar, lemon juice, butter and rum together and simmer for 10 minutes. Peel the bananas and slice them in half, lengthwise. Place them cute side down, in a buttered baking dish and pour the hot syrup over them. Bake for 30 minutes, turning once. Let cool.