Louis' Mixed Drinks with Hints for the Care & Serving of Wines by Louis Muckensturm (1906, p.101)

1 unitegg yolk — Egg yolkbase
milk — Boiling milkdilution
0.5 bar-glassdry sherry — Dry sherrymodifier
1 teaspoonfulsugar — Sugarsweetener
  1. Beat the yolk with sugar, add the dry sherry, put into a hot whiskey-glass, fill with boiling milk, stir well, grate nutmeg on top, and serve.

Garnish: Grated nutmeg