01 - Place grapes, cold water, sugar, and fresh lime juice into the blender container.
02 - Blend on high speed until completely smooth and frothy, approximately 1-2 minutes.
03 - Pour blended mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing with a spoon to extract liquid and remove grape solids and skins.
04 - Taste the beverage and add additional sugar or lime juice as needed to achieve desired balance.
05 - Refrigerate until thoroughly chilled or serve immediately over ice cubes in glasses.
06 - Decorate glasses with fresh mint sprigs or additional whole grapes if desired.