Café Royal Cocktail Book by W. J. Tarling (1937, p.193)

lemon juice — Juice of 1/4 of a Lemonacid
1 unitegg yolk — Yolk of a fresh Eggbase
0.5 partgin — Seager's Dry Ginbase
0.4 partCointreau other
0.1 partGrenadine — Grenadinesweetener
  1. Shake.

Invented by "Romaine"; prize-winner International Cocktail Competition, Frankfurt-on-Main, October 1934.