Frozen Raspberry Rum Slush

Description
This is a recipe I obtained from an estate sale. I obtained it when I purchased the family collection from the Crawford Estate in Irving, Texas in 1982.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * 1 cup sliced fresh raspberries
 * 3 cups water
 * 12 ounces frozen pink lemonade concentrate
 * 6 ounces frozen limeade concentrate
 * 1½ cups light rum

Directions

 * 1) Puree raspberries then add concentrates, water and rum.
 * 2) Stir until concentrate is thawed.
 * 3) Put in containers and freeze.
 * 4) Scrape to make slush.
 * 5) Add 7-Up to slush in glasses if preferred.
 * 6) Serve in champagne glasses.