The Color of Onions
Bulb onions can be yellow, red, or white. Approximately 87 percent of the crop is devoted to yellow onion production, with about eight percent red onions, and five percent white onions.
Yellow Onions are full-flavored and are a reliable standby for cooking almost anything. Yellow onions turn a rich, dark brown when cooked and give French Onion Soup its tangy sweet flavor.
Red Onions, with their wonderful color, are a good choice for lots of fresh uses or for grilling, charbroiling, and roasting.
White Onions are often used in prepared salads, white sauces, and is the traditional onion for classic Mexican cuisine. They have a golden color and sweet flavor when sautéed.
(Source: The National Onion Association)