The Only Way You Should Store Onions, According to a Food Editor

Do your onions sprout? Or get soft? Or moldy? How you store them can prevent this from happening. Here’s a mini guide for picking the best onions at the grocery store and storing them.

How To Pick the Best Onion

When selecting onions at the store, check them for soft spots or mold. Damaged onions don’t last as long. According to the National Onion Association, onions should have little scent and should feel firm.

For the longest-lasting onions, keep them whole, with the skin on. Under the best conditions, onions can last weeks, or even months.

The Best Way To Store Onions

Whatever you do, don’t keep onions in the fridge. Onions like nooks that are cool, dry, and dark. A refrigerator is cold (not cool) and humid (not dry). Put your onions in the fridge and they’re more likely to get soft, which can make them spoil.

• If possible, store whole onions away from light. Onions are still living bulbs –light is a cue for them to sprout, and you don’t want them to sprout, because it changes their flavor.
• Don’t keep whole onions in a plastic bag. Trapped moisture can lead to mold. You want onions to breathe. If they’re in a plastic bag, take them out of the bag.
• Ideally, use perforated or mesh storage bins for better airflow to help keep moisture levels down.
• For short-term storage—when you plan to use the onions in a day or two—a bowl on the counter or in a cupboard is just fine.

A perforated plastic bin or wire mesh basket in a cool cupboard is terrific. A basement is another cool, dark place. Granted, it’s not that handy, but you can always keep a few onions in the kitchen ready and have the bigger lot downstairs for long-term storage.

Shallots are kind of like baby onions. Everything we said above about onion storage goes for shallots, too.

How To Store Cut or Chopped Onions

Many recipes call for just half an onion. Put the unused half in a plastic bag, seal, and refrigerate for up to a week.

Pre-chopping or slicing onions can be a handy meal prep strategy for faster weeknight cooking. Pop them into a zip-top bag or airtight container and aim to use them within five days; their oniony smell only strengthens with age.

Can You Freeze Onions?

Whole onions, no. Don’t freeze those.

Cut onions? Yes! Freeze chopped or sliced onions in an airtight zip-top bag with as much air pressed out as possible and use them within six months. Frozen onions are best used for cooking, not for serving raw.

Have a ton of onions you want to use up? Make caramelized onions! (They freeze great, too).