What Is an Onion?
Onion (Allium cepa) is a layered root vegetable in the lily family. It comes in three main colors: yellow, red (purple), and white; each differs in aroma intensity and pungency. In Turkish cuisine, nearly every dish begins with sautéed onion, making it one of the most basic kitchen ingredients.
Red onions have a milder, slightly sweet flavor when eaten raw, while yellow onions develop a deep, caramel-like flavor when cooked. White onions are the most pungent and least sweet; they are often used in salsa and pickles.
Onion Nutrition Facts
Onions are low in calories; 100 g contains about 40 kcal, 1.7 g of fiber, and 9.3 g of carbohydrates. Sulfur compounds, which give onions their pungent smell, and flavonoids such as quercetin are among their most notable plant compounds.
What Are the Benefits of Onions?
Research on quercetin and sulfur compounds in onions is ongoing; some studies consider these compounds as part of a balanced diet. Their low-calorie, fiber-containing profile makes them easy to add to daily meals.
This information is general; an onion is a food and is not a substitute for medical treatment.
How to Choose Onions
A good onion feels firm and heavy in your hand, with dry, crisp skin.
- The skin should be dry, shiny, and smooth; damp or moldy skin is a sign of spoilage.
- Choose onions that have not sprouted or grown green shoots.
- Onions that are tightly closed and have no soft spots keep longer.
How to Store Onions
Onions can be stored for 3–4 weeks in a cool, dry, airy place away from light. Do not store them with potatoes; moisture and gas from the potatoes cause the onions to rot faster. Cut onions stay fresh for 3–4 days in an airtight container in the refrigerator.
How to Use Onions in the Kitchen
Onions are used raw, sautéed, or caramelized. Cooking time and heat directly affect their flavor: onions cooked slowly over low heat develop a sweet, deep aroma.
How to Chop an Onion Without Tears
Chilling an onion in the refrigerator for 10–15 minutes before cutting slows the evaporation of compounds that irritate the eyes. Using a sharp knife and minimizing the exposed cut surface also helps; working in a well-ventilated area can reduce the effect.
How to Make Caramelized Onions
Cook thinly sliced onions with a little oil over low heat for 30–40 minutes, stirring often. When their sugars are released and they turn deep golden brown, the caramelized onions are ready; use them in burgers, soups, and pilaf.
Which Recipes Use Onions?
Dolma (stuffed vegetables), vegetable dishes, soups, and nearly all sauté-based recipes start with onions. Raw onions feature in shepherd salad and as a side garnish with kebabs; caramelized onions are popular in burgers and pilaf.
Frequently Asked Questions
Why do your eyes water when you chop an onion?
When an onion is cut, its cells break down and a sulfur-containing compound becomes a gas when it contacts the air and reaches the eyes, causing irritation and watering. Chilling the onion and cutting it in a well-ventilated area can reduce the effect.
Are raw onions bad for your stomach?
Raw onions may cause a burning sensation or gas in people with sensitive stomachs; this usually depends on the amount and individual tolerance. If symptoms persist, it is recommended that you consult a professional.
What is the difference between red and yellow onions?
Red onions are milder and slightly sweet, and are often eaten raw. Yellow onions develop a deeper, caramel-like flavor when cooked and are used more often in sauté-based dishes.
What can you do with onion skins?
Onion skins are not eaten directly, but they are traditionally added to simmering liquid to give broth and some dishes color and depth; strain them out and discard them after cooking.
Can you eat a sprouted onion?
A lightly sprouted onion is generally edible; remove the sprout and use the rest if it looks firm and sound. Discard onions that are soft, moldy, or smell bad.