 Chile and Peru both claim the pisco sour as their national drink , and each asserts ownership of the cocktail 's base liquor — pisco ; consequently , the pisco sour has become a significant and oft @-@ debated topic of Latin American popular culture . The two kinds of pisco and the two variations in the style of preparing the pisco sour are distinct in both production and taste . Peru celebrates a yearly public holiday in honor of the cocktail during the first Saturday of February . 
