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Associated Press
A hamburger made from ground beef containing what is derisively referred to as "pink slime," or what the meat industry calls "lean, finely textured beef," is ready for tasting Thursday, March 15, 2012 in Concord, N.H.  Under a change announced Thursday by the U.S. Department of Agriculture, districts that get food through the government's school lunch program will be allowed to say no to ground beef containing the ammonia-treated filler and choose filler-free meat instead. The low-cost filler is made from fatty meat scraps that are heated to remove most of the fat, then treated with ammonium hydroxide gas to kill bacteria such as E. coli and salmonella. (AP Photo/Jim Cole)

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