Dissolve meringue powder in lime juice. Fill a cocktail shaker with ice. Add meringue mixture, pisco, simple syrup and bitters. Cover and shake vigorously until frothy, mixed and chilled, about 45 seconds. Strain into a glass and garnish with grated zest or a wedge of lime.
Put the sugar and water in a small saucepan. Cook over low heat, stirring, until the sugar dissolves. (Alternatively, heat in the microwave.) Store in a sealed container in the refrigerator for up to 1 month.
Yield: about 1 1/2 cups
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