Onions are a widely used vegetable known for their strong flavor and aroma. They come in various varieties, including yellow, red, and white, each with distinct taste profiles. Onions are made up of layers, with the outer skin typically being papery and the inner layers being firm and crunchy. When raw, onions can have a sharp, pungent taste, but when cooked, they become sweeter and milder, often caramelizing to develop a rich, savory flavor.

Onions are a versatile ingredient used in a variety of dishes such as soups, salads, stir-fries, and sauces. They can be eaten raw, sauted, grilled, or fried. Besides being a staple in cooking, onions are also known for their potential health benefits, offering antioxidants, vitamins, and minerals. They are also valued for their ability to induce tears when cut due to the release of sulfur compounds.