I just bought this meat yesterday, but when I broke the block apart to cook tacos, the inside is completely grey while the outside is red. It smells okay, but it looks unappetizing and risky. What wou

If you don’t plan to use the beef within a day or two, consider freezing it to extend its freshness.

Myoglobin, a protein in muscle tissue, plays a key role in meat coloration. When exposed to air, myoglobin binds with oxygen, forming oxymyoglobin, which gives meat its appealing red hue. However, when oxygen is limited — as it is inside a tightly packed block of ground beef — myoglobin shifts to metmyoglobin, leading to a greyish coloration.

This change is