I got this idea after reading that Victoria Beckham exists on a diet of frozen grapes and edamame.  Moving right past the opportunity to comment on that, let's think about sorbet made from one ingredient and the gorgeous simplicity of it.

If you want to complicate things, feel free to peel the grapes:  drop them into boiling water for one minute, drop them immediately into cold water, then rub peels off.  That being said, don't bother.  I am just as much into the chewy bits being in the sorbet as I am into the idea making this in two minutes.     

Prep Time:  2 Minutes (more if you peel the grapes)
Cooking Time:  none
Yield:  Varies
Ingredients:
Red or Green Grapes
Water

Freeze grapes for a few hours or overnight (or just leave them in the freezer for this or an anytime snack).  Pull frozen grapes off the vine and place in a food processor.  Blend until broken up and add water, a little at a time while blending, until consistency is like sorbet.  Serve immediately, garnished with more frozen grapes.