Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   lemon juice
   3      teaspoons     unflavored gelatin
     1/8  teaspoon      salt
   1 1/2  teaspoons     arrowroot
   2 1/2  cups          frozen blueberries -- sweetened partially
                        -- thawed
                        non-nutritive sweetener equivalent to 2
                        -- cups sugar

Preparation:

Mix lemon juice, gelatin, salt, and arrowroot; stir in blueberries. Boil gently until mixture thickens, stirring constantly (about 3-4 minutes). Stir constantly, boiling at full boil for 2 minutes. Remove from heat; stir in sweetener. Fill and seal jars