This cocktail gets its luxurious feel from the addition of frothy egg whites, which brings out the sweet notes of the muddled green grapes.
Combine grapes, sugar, and rind in a cocktail shaker; muddle. Add pisco and juice; shake 30 seconds.
Add bitters and whites; fill shaker with ice. Shake vigorously 2 minutes or until frothy. Strain into 2 glasses.
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