Sloeberry Cocktail is a simple bitters-and-sloe-gin aromatic from the late Harry of Ciro sequence.
Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.78) — Harry of Ciro's 1923
| 1 dash | Angostura bitters — Angostura Bitters | base |
| 1 glass | sloe gin — Sloe Gin | base |
| 1 dash | orange bitters — Orange Bitters | bitter |
This matters because it preserves a direct sloe-gin aromatic line without vermouth or citrus.
Barflies and Cocktails by Harry McElhone and Wynn (1927, p.73) — Barflies 1927
| 1 dash | Angostura bitters — Angostura Bitters | base |
| 1 glass | sloe gin — Sloe Gin | base |
| 1 dash | orange bitters — Orange Bitters | bitter |
This matters because it keeps a very compact sloe-gin aromatic line visible beside the larger sour and fizz branches.
See also: Ruby Fizz, Blackthorne Cocktail