Question: do you ripen a pineapple?
Answer: Store the unripe pineapple with other fruits that ripen easily, such as apples, bananas, or tomatoes. They eject ethylene, which is nothing but a plant hormone that helps ripening. ... To ripen an unripe pineapple sooner, always place it with its base upwards and balancing it on its leaves, that is, place it upside down.