Sunday's New York Times had an interesting article about food safety and hamburger... I think I'm swearing off pre-formed patties altogether and may start getting individual pieces of meat ground at the grocery store. I wonder if Giant would do that?
Apparently, in addition to having superb steak, Costco actually tests for E. Coli before grinding its meat. It's fairly unique among big producers in this policy.
"Cargill records show that the hamburgers were made from a mix of slaughterhouse trimmings and a mash-like product derived from scraps that were ground together at a plant in Wisconsin. The ingredients came from slaughterhouses in Nebraska, Texas and Uruguay, and from a South Dakota company that processes fatty trimmings and treats them with ammonia to kill bacteria."