The Color of Onions Onions come in three colors yellow, red, and white. Approximately 88 percent of the crop is devoted to yellow onion production, with about 7 percent red onions and 5 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. The red onion, with its wonderful color, is a good choice for fresh uses or in grilling and char-broiling.
White onions are the traditional onion used in classic Mexican cuisine.
They have a golden color and sweet flavor when saut ed.