The Cocktail Book a Sideboard Manual for Gentlemen (1901, p.37)
| lemon peel — curl of lemon peel | acid | |
| 2 dashes | Angostura bitters | base |
| 0.67 portion | Scotch whisky — Scotch whiskey | base |
| 0.33 portion | Italian vermouth — Source gives one-third. | modifier |
- Fill a mixing glass with ice and add the ingredients.
- Mix and strain into a cocktail glass.
- Add a curl of lemon peel.
Garnish: Curl of lemon peel.
Ice: Ice
This helps show how quickly Scotch was proliferating across multiple named aromatic branches, not just the Rob Roy line.
The drink stays a classic stirred aromatic despite its national-marking name.