Minced onion is great to have on hand when you don't have fresh onion, or when you need onion in a dry application, such as dry rubs. For that sweet onion flavor, you can use it as-is in soups and stews, or you can rehydrate it in a bit of water before using it in sauces and salad dressings. If you're making onion bagels at home, you'll want some of this stuff.