Some discrepancy exists on the exact date when Morris created the popular cocktail. Mixologist Dale DeGroff asserts the drink was invented in 1915,[25] but other sources argue this happened in the 1920s.[26] The Chilean web newspaper El Mercurio Online specifically contends historians attribute the year of the drink's invention as 1922, adding that "one night Morris surprised his friends with a new drink he called pisco sour, a formula which mixes the Peruvian pisco with the American sour" (in Spanish: "Una noche Morris sorprendió a sus amigos con una nueva bebida a la que llamó pisco sour, una fórmula que funde lo peruano del pisco con el 'sour' estadounidense.").[27]