Place a single layer of watermelon in a shallow pan; freeze until firm. Remove watermelon from freezer, and let stand 5 minutes. Drop watermelon through food chute of a food processor or blender with the motor running. Add frozen chunks of raspberries alternately with mineral water, processing until smooth.

Yield: 5-1/2 C.This light watermelon berry slush is great for a picnic! For more picnic recipes, check out our collection of 150 Picnic Potluck Recipes.