ll types of onions are good for you, but this dark reddish-purple variety, sometimes called purple onion, has especially high levels of quercetin and other helpful plant compounds known as flavonoids. Flavonoids give many fruits, vegetables, and flowers their colors.

Red onions have a mild, sweet taste and add color and flavor to many dishes. Use them raw as a crunchy addition to salads, sandwiches, and salsa.