Did you know you can actually freeze caramelized onions? Indeed, you can! Faith mentioned this great tip in her post on using up a bunch of onions, and it's such a good one that we didn't want anyone to miss it. Here's how we do it.We love the nutty, sweet flavor of caramelized onions in just about any dish, but the actual caramelizing process can take too long for a weeknight meal. Since you can just as easily caramelize one onion as five or six of them, we make a big batch of caramelized onions at once, and then freeze what we won't use in a few days to have on-hand for quick meals.
We usually freeze the onions in ice cube trays or muffin tins. Once they're frozen solid, we pop them out of the tray and store them in a sealed container. The smaller portions make it easy to use exactly what we need, plus the onions thaw more quickly in the pan.
As long as they don't start to develop freezer burn, frozen caramelized onions will keep for several months. Give it a try!