The Old Waldorf-Astoria Bar Book by Albert Stevens Crockett (1935, p.91)

1 ponyrum — Bacardibase
1 ponyvanilla base
milk — filldilution
1 wholeegg other
1 gratenutmeg other
0.5 teaspoonsugar sweetener
  1. Shake well, strain, and grate nutmeg on top.

See also: Egg-Nog