01 - Place grapes, water, sugar, and lime juice in a blender.
02 - Blend on high until completely smooth and frothy.
03 - Strain through a fine mesh sieve or cheesecloth into a pitcher to remove skins and pulp.
04 - Taste and add additional sugar if more sweetness is desired.
05 - Refrigerate until cold or pour immediately over ice. Garnish with fresh mint or whole grapes if desired.