2 oz of pisco
1 oz of Lime Juice
3/4 oz of Limoncello (or lemon liqueur)
1/2 oz of Cognac
1/2 oz of egg white (or egg)
3 dash of bitters
Add all ingredients but bitters to cocktail shaker and dry shake vigorously without ice. When nice and frothy, add ice, shake again to chill, and strain into a chilled cocktail coupe. Top with 3-5 drops of bitters.