Onion is a plant that is almost like a standard used in Indian food. It is also considered one of the main ingredients in raw salads. They are available in a variety of colors such as red, white, or yellow and are demanded in cold salads and hot soups. Slice, dice, or cut it into rings and then put it into sandwiches and burgers. Onions give off a strong flavor and a distinct scent after being baked; this is because of the sulfur compound found in the vegetable. Onions are believed to be rich in biotin. The majority of flavonoids, called anti-oxidants, are concentrated in the outer layer; therefore, it is best to take as little as you can when you remove the layers.