The Wisconsin Historical Society's website notes the "Cannibal Sandwich" consists of raw, lean ground beef served on bread (especially rye cocktail bread) with sliced onions, salt and pepper. It's also known as "tiger meat," "steak tartare," or simply, "raw beef and onions." According to the Wisconsin Historical Society, these sandwiches have traditionally been served at holiday parties and other festive gatherings in the Milwaukee area. Milwaukee historian, John Gurda, who served it at his 1977 wedding reception, told FOX News in 2013 the sandwiches have been a festive dish in German, Polish and other ethnic communities in the Milwaukee area...