|Amaro Averna||4.5cl 1.5oz|
|Lemon juice||3.0cl 1.0oz|
|Simple syrup||0.75cl 0.25oz|
Along with most other amaro cocktails, the Amaro Sour is a modern creation, as amaro were mostly enjoyed straight and not very popular outside of their original locale. As such, there is not much background on the Amaro Sour specifically, but it clearly makes reference to and evokes the classic Whiskey Sour line of cocktails.
This specific recipe comes from Amaro by Brad Parsons, and he credits its composition to Jeffrey Morganthaler's Amaretto Sour.
Naturally, you can sub in a different amaro for the Averna, but the Averna's a nice entry-level amaro that goes particularly well with the bourbon.