01 - Combine grapes, cold water, sugar, and fresh lime juice in a blender container.
02 - Blend on high speed until completely smooth and frothy, approximately 30-45 seconds.
03 - Pour mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing firmly to extract all liquid while removing pulp and skins.
04 - Taste the strained beverage and add additional sugar or lime juice as needed to balance sweetness and acidity.
05 - Refrigerate until thoroughly chilled or pour immediately over ice cubes in glasses.
06 - Top with fresh mint leaves or additional grapes for presentation if desired.