|Patron Reposado Tequila|
|De Kuyper Crème de Menthe|
|Freshly squeezed lime juice|
|Giffard Sugar Cane Syrup|
With white créme de menthe instead of green créme de menthe.
Named after Harper Lee's 1960 novel To Kill a Mockingbird, this is thought to have been created some time in the 1960s. Genius.