I thought some of this sounded embellished, so I searched for the company, Beef Products. If you click on "the Process", its all there, and accurate to the story.
The great American staple. Don’t worry, burgers really do come from cows—but have you ever wondered how those giant chains process and distribute so much meat so cheaply? And . . . are you sure you want to know?
The Truth: Most fast-food hamburger patties begin their voyage to your buns in the hands of a company called Beef Products. The company specializes in taking slaughterhouse trimmings—heads and hooves and the like—that are traditionally used only in pet food and cooking oil, and turning them into patties. The challenge is getting this byproduct meat clean enough for human consumption, as both E. coli and salmonella like to concentrate themselves in the fatty deposits.
The company has developed a process for killing beef-based pathogens by forcing the ground meat through pipes and exposing it to ammonia gas—the same chemical you might use to clean your bathroom. Not only has the USDA approved the process, but it's also allowed those who sell the beef to keep it hidden from their customers. At Beef Products’ behest, ammonia gas has been deemed a “processing agent” that need not be identified on nutrition labels. Never mind that if ammonia gets on your skin, it can cause severe burning, and if it gets in your eyes, it can blind you. Add to the gross-out factor the fact that after moving through this lengthy industrial process, a single beef patty can consist of cobbled-together pieces from different cows from all over the world—a practice that only increases the odds of contamination.