Pisco Sour

Can it be a Pisco Sour without the Amargo Chuncho Bitters?

Pisco Sour
makes 2

4 ounces Pisco (here, Barsol)
2 ounces lime juice
1/2 – 2 ounces simple syrup (use it to your taste)
1 egg white
one hefty dash of Amargo Chuncho Bitters
2 pieces of lime peel, no zest

In a shaker with ice, combine Pisco, lime juice, simple syrup, egg white and one hefty dash of Amargo Chuncho Bitters.  Shake vigorously.  Divide between two old-fashioned glasses.  Squeeze one piece of lime peel over the top of each cocktail.  Then, add one tiny drop of Chuncho Bitters to each glass.  Serve immediately.

Cheers!