McDonald's McRibs ingredients: Facts about the sandwich with a cult-like following

McDonald’s popular McRib returned to restaurants across the country Monday, but do you know what it really is?

Business Insider breaks down some facts about the McRib:

1. It’s made up of “restructured meat technology.”

According to Chicago magazine , it includes tripe, heart, and scalded stomach.

2. It has about 70 ingredients, “including a flour-bleaching agent used in yoga mats.”

That flour-bleaching agent is called azodicarbonamide, according to the article.

3. Processing the McRib takes about 45 minutes.

That’s how long it takes to go from fresh pork to flash-freezing it, the report said.

4. It made its first appearance in 1981.

The McRib has come and gone, which created a cult-like following.

For more facts, check out BusinessInsider.com.