Can You Freeze Onions?
Yes, you can freeze onions for up to 8 months. They become soft after thawing, so frozen onions work best in cooked dishes rather than raw applications. Chopping before freezing saves prep time later, and they can go directly from freezer to pan.
Key Takeaways
- Freezing is an excellent way to preserve onions, especially when you have a surplus or want to reduce prep time during cooking.
- Frozen raw onions have a strong odor; double-bag them or use airtight containers to prevent smell transfer.
- Whole onions do not freeze well; always chop or slice first.
Explanation
Freezing is an excellent way to preserve onions, especially when you have a surplus or want to reduce prep time during cooking. Raw onions freeze well and retain their flavor for use in frozen soups, stews, stir-fries, and sautéed dishes.
To freeze raw onions, peel and chop to your preferred size, spread on a baking sheet to flash freeze for 1-2 hours, then transfer to freezer bags. This prevents them from clumping into a solid mass.
Caramelized or sautéed onions also freeze beautifully. Cook them fully, cool completely, then portion into freezer bags or containers. They thaw quickly and add instant flavor to dishes.
Different onion varieties behave slightly differently when frozen. Yellow onions are the best all-purpose choice for freezing because their flavor mellows and sweetens during cooking from frozen. Red onions lose some of their vibrant color but retain their slightly sharper taste, making them suitable for chili and stews. Sweet onions like Vidalia have higher water content (about 90%) and become softer faster, so they should be used within 3-4 months rather than the full 8 months.
Frozen diced onions save an average of 5-7 minutes of prep time per meal, which adds up significantly for daily cooking. Freeze them in 1/2-cup or 1-cup portions on a parchment-lined sheet, then bag once solid. They can go straight from the freezer into a hot skillet with oil and will begin to sizzle within 30-45 seconds, breaking apart naturally as the ice melts and evaporates.
One underappreciated benefit of frozen onions is that they release the tear-inducing compound syn-propanethial-S-oxide (learn more about why onions make you cry) in much smaller quantities when cooked from frozen. Since the volatile gas requires warm temperatures and intact cells to reach your eyes, the frozen cells rupture and release their contents directly into the hot pan rather than into the air. This makes cooking with frozen onions significantly less likely to cause crying compared to chopping fresh onions.
Things to Know
- Frozen raw onions have a strong odor; double-bag them or use airtight containers to prevent smell transfer.
- Whole onions do not freeze well; always chop or slice first.
- Green onions can be frozen but are best used in cooked dishes as they become limp. They pair well with frozen cooked rice for quick fried rice.