Giant sandwich photo op fail. See The 10 Dirtiest Foods You’re Eating.
“Add fresh oregano to your burgers and meat loaf. When researchers at Kansas State University mixed a variety of common household spices into ground beef to test their antibacterial properties, oregano tested as one of the best at wiping out E. coli. Use at least 1 tablespoon per pound of meat. Just as important, flatten your patties — thick burgers will char on the outside before the interior reaches the required 160°F.” [Source]