To date, onions are one of the most important vegetable crops in cooking. Onions can also be used as a spicy-vitamin snack or as a flavoring additive to various soups, gravy, sauces, and minced meat. In the production of frozen onions, all its properties are preserved. Such an onion, as before, is rich in vitamins, which are especially abundant in its leaves. It contains a sufficient amount of sugar, which depends on the variety, essential oils and protein. Onions have excellent bactericidal properties, which appear due to the presence of compounds, volatile and essential. They give onions a pleasant taste and aroma.