Winter fruits

Citrus fruits don’t get sweeter after they are picked from the tree, so ripening at home won’t make them sweeter. If you live in a climate where you still have farmers markets open, buy citrus there.

Kiwi, however, are like bananas: they can be picked well before they are ripe and still sweeten afterwards. While the flavor of a vine-ripened kiwi is better (just like bananas), they are still pretty good after ripening on your counter.