Onions: Features and Uses

Onions are a basic ingredient in many dishes, and raw and cooked onions have different flavors. They are one of the most essential vegetables in the kitchen. This guide explains how to choose, store, and use onions.

How Are Onions Used in Cooking?

Onions add different aromas to dishes when used raw or sautéed. Onion juice is made by straining grated onion and can add flavor to some meatball mixtures. Because raw and cooked onions taste different, prepare them according to the result you want in the dish. These details are based on traditional sources; anyone with a chronic condition should consult a health professional before making dietary changes.

How Should You Choose Onions?

When buying onions, look for dry, crisp, shiny skin and a firm, dried stem end. Avoid onions that are soft, sprouting, or damp. Onions that feel heavy for their size are generally juicier and fresher. Red onions are better suited to eating raw, yellow onions to sautéing and cooking, and white onions to salads because of their mild, less sharp flavor. Choosing the right variety for the dish can directly affect the result.

How Should Onions Be Stored?

Whole onions can be stored for weeks in a mesh bag or basket in a cool, dry, well-ventilated place away from light. Onions stored in plastic bags retain moisture and spoil faster. Do not store onions with potatoes, because moisture from the potatoes can make onions sprout sooner. Chopped onions can be stored in an airtight container in the refrigerator for 3–4 days, or frozen in portions for longer storage.

How Can You Reduce Eye Irritation When Chopping Onions?

To reduce tearing while chopping onions, chill them in the refrigerator or freezer for a few minutes first; the lower temperature slows the release of volatile compounds that cause eye irritation. Using a sharp knife can also help by crushing fewer cells. Chopping onions under running water or in front of a fan are other common methods. Cutting off the root end last may also delay tearing.

How Are Onions Used in the Kitchen?

When onions are sautéed over low heat for a long time, they caramelize. This brings out their natural sugars, turning their sharp flavor into a sweet, deep aroma. Caramelized onions are often used in burgers, pizza, and soups. Raw onions are used in salads, while roasted onions are served with grilled meat. Pickled onions add a tangy contrast alongside sandwiches and kebabs.