01 - Combine grapes, water, sugar, and lime juice in a blender. Process on high speed until completely smooth and frothy.
02 - Pour blended mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing to extract liquid and remove solids.
03 - Taste the strained beverage and add more sugar or lime juice as needed to achieve desired sweetness and balance.
04 - Pour over ice cubes in glasses. Garnish with fresh mint leaves or additional grapes if desired. Serve chilled.