Onion beef BEEF IS RICH IN HIGH-QUALITY NUTRIENTS SUCH AS PROTEINS, CALCIUM, IRON, PHOSPHORUS AND VITAMIN A, ONIONS ARE RICH IN MUSTARD OIL, AND HAVE ACCELERANT ACCELERANTS, AND RICH PLANT FIBRES PROMOTE GASTRIC CREEPING AND DIGESTION. THE TWO ARE PAIRED, FRESH AND WARM, AND READY TO EAT。