Café Royal Cocktail Book by W. J. Tarling (1937, p.128)
| 0.25 part | dry vermouth — French vermouth | base |
| 0.5 part | gin | base |
| 0.25 part | rum — Jamaica rum | base |
- Mix.
Invented by Heini Schmidt.
K.O. is gin with Jamaica rum and French vermouth.
Café Royal Cocktail Book by W. J. Tarling (1937, p.128)
| 0.25 part | dry vermouth — French vermouth | base |
| 0.5 part | gin | base |
| 0.25 part | rum — Jamaica rum | base |
Invented by Heini Schmidt.