Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1 1/2  cups          cider vinegar
     1/2  cup           ketchup
     1/2  teaspoon      red pepper flakes
   1      tablespoon    sugar
   1      teaspoon      salt

Preparation:

Combine all and stir well. Serve at room temp. Keeps indefinitely.