Is it good to cook beef until a bit reddish?

No, it is not recommended to cook beef until it is a bit reddish. This is because undercooked beef can contain harmful bacteria that can cause foodborne illness. The Centers for Disease Control and Prevention (CDC) recommends cooking beef to an internal temperature of at least 145 degrees Fahrenheit to ensure that it is safe to eat. This can be done by using a meat thermometer to check the internal temperature of the beef before it is removed from the heat source.