Jessica Sutton didn’t know there was anything unusual about her family’s holiday tradition until she started bringing boyfriends home for Christmas. She grew up on a farm with strong German roots in Howards Grove, a small town in southeastern Wisconsin. To her Christmas Eve always meant performing “O Christmas Tree” in German at the church Christmas pageant by candlelight, followed by “a little Christmas gathering of the immediate family where we had cookies, nuts, and, of course, cannibal sandwiches.” Also known as tiger meat or wildcat, cannibal sandwiches are a…