If you know what a Thanksgiving sandwich is, then your mouth is already watering. If you don't, then let me explain. Alternately known as a Pilgrim or Puritan sandwich, or even a Thanksgiving leftovers sub, these fine delicacies are made with the centerpieces of the typical holiday dinner: turkey, stuffing and cranberries. Sometimes, they include gravy or onions or other ingredients, but the key is the combination of sweet. savory and salty even sultry flavors.