The Old Waldorf-Astoria Bar Book by Albert Stevens Crockett (1935, p.101)

1 juicelemon juice — juice of half a lemonbase
1 jiggerWhiskey base
0.5 ponywater dilution
2 sprigsmint other
0.5 spoonsugar sweetener
  1. Stir well, strain, and serve with fruit.

See also: Pequot Sour