Café Royal Cocktail Book by W. J. Tarling (1937, p.170)

2 dashesVinegar base
1 unitegg — do not break the eggother
pepper and salt — a littleother
2 dashesTabasco — Tabasco Sauceother
1 teaspoonfulWorcestershire sauce — Worcester Sauceother
  1. Do not break the egg.