Put the peanut butter into a small bowl and whisk in the pineapple juice. Add the vinegar, curry powder, and red pepper flakes. Check the flavor and add stevia or other sweetener to taste. Pour over broccoli slaw and mix well.
Refrigerate for at least an hour to allow flavors to develop. Stir in grapes or pineapple just before serving, garnished with a sprinkling of roasted peanuts, if desired.
A quality curry powder, such as Maharajah, will provide the best flavor.One serving is 1 point on Weight Watchers Freestyle program.