Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.67) — Harry of Ciro's 1923
| 0.5 glass | gin | base |
| 0.5 glass | creme de cassis — Cassis | modifier |
| 0.5 glass | French vermouth — French Vermouth | modifier |
- Shake well and strain into cocktail glass.
This matters because it preserves another compact berry-aperitif branch in the London 1923 field.
The balance between gin, French vermouth, and cassis is the structural point here.