01 - Place grapes, water, sugar, and lime juice in a blender container.
02 - Blend on high speed until completely smooth and frothy.
03 - Pour mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing to extract all liquid and discard solids.
04 - Taste the strained beverage and add additional sugar if desired.
05 - Pour over ice cubes in glasses and garnish with fresh mint leaves or whole grapes.