Cocktail Boothby's American Bar-Tender by Wm. T. Boothby (1891, p.49)
| 1 jigger | vermouth | base |
| Apollinaris mineral water — Apollinaris | dilution | |
| gum syrup — Added to taste. | sweetener |
- Place ice, gum syrup to taste, and a jigger of vermouth in a long thin glass.
- Fill with Apollinaris, stir, and serve.
Ice: Cube ice
This is a useful low-proof aperitif checkpoint because it treats vermouth as a complete mineral-water service drink, not just a cocktail modifier.
The identity lies in direct in-glass lengthening with mineral water rather than stirring a compact cocktail.