Cranberry Mayo is a excellent addition to a post-Thanksgiving sandwich, and you probably have the ingredients in your fridge. I use Stonewall Kitchen's New England Cranberry Relish to make this - but you can use leftover homemade cranberry sauce or cranberry sauce from a can.
You will need:
Cranberry Relish or Cranberry Sauce
Mayo - whatever you have in the fridge is fine
Mix 3 parts Cranberry Relish to 2 parts mayo. Mix together.
Add to a sandwich. I recommend Cranberry Mayo, Turkey, and Stuffing on a roll.