What do you call a mash of beef trimmings that have been chopped and then spun in a centrifuge to remove the fatty bits and gristle? According to the government and to the company that invented the process, you call it lean finely textured beef. But to the natural-food crusaders who would have the stuff removed from the nation's hamburgers and tacos, the protein-rich product goes by another, more disturbing name: Pink slime.

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