Q. How does one speed up the ripening of kiwis?
Good news kiwis are one of a category of fruits that ripen and get sweeter after they've been picked (as opposed to peaches, apricots, most melons, plums, etc., that do not get any sweeter after they're picked). This is especially meaningful for kiwis, as they are commercially harvested when they are rock hard and shipped from California, Chile, and New Zealand to our markets, where they generally are still rock hard or nearly rock hard when we get them home.
As with many unripe fruits, you can put kiwis in a paper bag with an apple or a banana, close it up tight, and the ethylene gas given off by the apple or banana will speed the kiwis to ripeness. Once ripe, they should be stored in the refrigerator.