1. Look at the color of beef

① Fresh beef

Normal fresh beef is basically slaughtered and marketed on the same day, and has not been frozen, so the color of beef is bright and has obvious luster. The fat of beef is white or yellow, which looks particularly appetizing.

② Thawed frozen beef.

After a long period of freezing, if the beef is cooked immediately after thawing, the color length of the beef does not change much. However, after the thawed frozen beef is put aside for a period of time, its color will be very light, the oil will be dull, and it looks very uncomfortable, which is particularly different from fresh beef.

II. Touch authentication

① Fresh beef

When you touch fresh beef with your hands, it feels sticky. When you press the muscle part of beef with your fingers, you can obviously feel elastic, and there will be a small amount of oil on your fingers. This is fresh beef.

② Frozen beef

After thawing, a part of the water in the frozen beef will be evaporated due to the long freezing time, so when you touch the beef with your hand, it feels soft and inelastic, and when you press the beef with your hand, you will see a small amount of water overflowing, which is the frozen beef thawed twice.

III. Odor identification

① Fresh beef

When we smell fresh beef, we can obviously smell faint blood smell and smell, which is a normal phenomenon. Only fresh beef has this taste and is easily smelled.

② Frozen beef

Because frozen beef has been stored in cold storage for a long time, even if it is tightly closed, the inside of beef will have a strong ammonia smell or sour taste, which is particularly obvious. As long as you smell it near beef, you can feel it immediately.