Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.71) — Harry of Ciro's 1923

1 teaspoonfulCointreau base
0.5 glassAmer Picon — Amer. Piconmodifier
0.5 glassDubonnet modifier
  1. Shake well and strain into cocktail glass.

This matters because it preserves a small bitter-orange aperitif branch built around Amer Picon and Dubonnet in London 1923.

The drink is structurally valuable because it treats modifiers as the whole drink rather than seasoning a base spirit.

L'Art du Shaker by Dominique Migliorero (1925, p.55)

0.4 partAmer Picon base
0.4 partDubonnet modifier
0.2 partCointreau other
  1. Stir cold and serve.

The source attributes this to Dick Garrich.

Barflies and Cocktails by Harry McElhone and Wynn (1927, p.66) — Dick Garrick attribution

1 teaspoonfulCointreau base
0.33 partAmer Picon modifier
0.33 partDubonnet modifier
  1. Shake well and strain into a cocktail glass.

This matters because it preserves a small Paris-quarter aperitif built from Cointreau, Picon, and Dubonnet.

See also: Parisian Cocktail, Opera Cocktail