Tips for storing onions: Onions can be temperamental. Storing them in a warm place or near other vegetables like potatoes can make them go bad rather quickly. Another thing that can turn them moldy in a hurry is keeping them in tightly sealed bags or containers. Here are a couple of ways to store your onions so they last longer. First, let your onions breathe. Try the cardboard crates used to hold clementines if you have any on hand, placing a handful of onions in each one so they're not too crowded. Alternatively, use a hole punch to make a bunch of holes in a paper bag, and store two or three in there. They'll get the cool darkness they crave, but still be allowed to breathe. Another thing about onions is that certain varieties, like super sweet Vidalia, can spoil faster if they are stored next to each other. To avoid that, grab an old pair of tights or panty hose (I know it sounds silly, but it works) and drop one onion at a time into one of the legs. Before adding the next onion, tie a knot in the hosiery so each onion is tied off from one another. This helps keep the onions from touching, and it allows moisture to evaporate so it doesn't ruin the onion. When you're ready to use one, simply use a pair of scissors to cut right below each knot to get the onion out.
Michelle Stark, Times food editor