Café Royal Cocktail Book by W. J. Tarling (1937, p.230)
| 1 slice | lemon — Lemon | acid |
| 1 dash | Angostura bitters — Angostura | base |
| 1 measure | gin — Gin | base |
| Soda water — Soda Water | dilution |
- Use a medium size glass and fill up with soda water.
Coaster is a simple gin and bitters cooler with a slice of lemon and soda.
Café Royal Cocktail Book by W. J. Tarling (1937, p.230)
| 1 slice | lemon — Lemon | acid |
| 1 dash | Angostura bitters — Angostura | base |
| 1 measure | gin — Gin | base |
| Soda water — Soda Water | dilution |