Peruvian Pisco Sour 2 oz pisco 1 oz fresh lime juice ¾ oz simple (i.e., sugar) syrup (to taste) 1 fresh egg white (or 2 tbsp pasteurized egg whites) 1 dash Angostura bitters Shake all but the Angostura vigorously with ice. Don’t stop shaking — the egg whites need to get nice and frothy. […]