Speaking of dessert, what if the fruit you bought for dessert isn't ripe? Is there anything you can do? Yes, there is. There is one way to ripen fruit faster. You will need a very ripe banana, with brown spots on it. Why? There is a gas That comes form ripe banana. The gas makes fruit ripen faster. If you put the dessert fruit in a paper bag with the ripe banana, soon it will be ripe.