Café Royal Cocktail Book by W. J. Tarling (1937, p.154)
| 0.17 part | lemon juice — fresh lemon juice | acid |
| 0.17 part | lime juice — fresh lime juice | acid |
| 0.33 part | Vodka | base |
| 0.33 part | curacao — blue curaçao | modifier |
- Shake.
Nervo-Knox
Nervo-Knox is vodka with blue curaçao, fresh lemon juice, and fresh lime juice.