First, you need Peruvian Pisco (Peruvian made brandy). You need 3 parts of Pisco with 1 part Lime juice and 1 part Sugar syrup. You put these ingredients together with an egg white and 4 ice cubes into a blender and serve in old fashion type glass. Pour 3 drops of Angostura bitter.
Love it. I was in holiday couple of weeks ago in Peru and when i tried it, i just loved it. Shame i can't buy Pisco from Peru here. Miss the flavor and the good that combine with food. Just like it a lot!
In Peru we have three different varieties of Pisco: Italia, Acholado and Puro. Try the Pisco Sour with Acholado, personally my favorite. Our Pisco, by now it's obvious I'm peruvian, may be more expensive, but it's also better. Never tried Chilean 'aguardiente'. Maybe it's good, maybe not, but there's only one Pisco. Enjoy it.
I first came across this drink in Chile many moons ago. I have two vintage bottles of Pisco and this summer I am going to try one or two again. This is the only drink I will go out of my way to try. Happy days. Once tried never forgotten.