Title: Plums in port
 Categories: Condiments, Jams
      Yield: 6 Servings
 
      8 lb Plums
      3 c  Sugar
      3 c  Water
      3 tb Slivered orange peel
      2    Sticks cinnamon
      2 c  Tawny port
 
  Prick plums with sterilized needle to prevent bursting. Combine sugar,
  water, orange peel and cinnamon sticks in a large sauce pot. Bring to
  a boil.  Reduce heat and simmer a few minutes.  Add plums, a layer at
  a time to heat through, about 2 minutes. Remove plums from syrup.
  Peel skins, if desired.  Pack hot plums into hot jars, leaving 1/2
  inch head space. Reheat syrup to a boil.  Remove from heat; discard
  cinnamon sticks. Stir in port. Pour over plums, leaving 1/2 inch head
  space. Remove air bubbles. Adjust caps.  Process 20 minutes in
  boiling water bath. Yield: about 3 quarts.
  
  From: Ball Blue Book Shared