Where's the beef? A better question may be what's in that beef? A South Dakota packing plant owner came up with a way to use fatty trimmings, once only suited for pet food and cooking oil, for lean ground beef. The answer is ammonia.

Ammonia-treated beef is now in 70% of the hamburger you eat.

Nothing's more all-American than the hamburger. Processed beef from Beef Products plant in South Sioux City, Nebraska is a component in most ground beef from fast food chain restaurants, like McDonald's and Burger King, to grocery stores to the nation's school lunch program.

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