Pisco Vs Stone Sour: Is There A Difference? - Tasting Table
Briefly

The Pisco Sour combines pisco (a grape-based spirit) with fresh lime juice, an egg white, simple syrup, and Angostura bitters, creating a frothy texture.
The Stone Sour is a bright, citrusy-sweet sipper not far off from another sour-style classic, the Amaretto Sour, offering a different flavor profile.
Read at Tasting Table
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