Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      cups          cranberries
   1      8 ounces can  mandarin oranges in juice
     1/2  cup           port wine
     1/2  cup           sugar -- or more if needed
   1      teaspoon      cinnamon
   1      tablespoon    cornstarch
   1                    splash port wine -- be generous

Preparation:

In a small saucepan combine cranberries, orange juice and zest, port, sugar and cinnamon. Bring to a boil, reduce heat to simmering and cook until cranberries are tender, stirring occasionally. In a small cup make a slurry with cornstarch and 1 tablespoon water. Whisk cornstarch mixture into cranberry sauce and cook, whisking, until sauce thickens. Taste and add more sugar, if necessary.