Carob (algarrobo in Spanish) grows abundantly on Peru's northern desert coast. The algarrobina is a rich and chocolaty cocktail made with carob syrup, pisco, egg yolk, and evaporated milk. Since pisco sours only use the egg white - algarrobinas are the perfect counterpart - allowing you to use the whole egg.
The photo was taken at my temporary house in Ferrenafe, where my hosts made sure I tried their beloved algarrobina. If you can't get an invitation into someone's home, they make tasty algarrobinas (and pisco sours) at the Gran Hotel Chiclayo bar.