Daly's Bartenders' Encyclopedia by Tim Daly (1903, p.82)
| Scotch whisky — Scotch whiskey | base | |
| 1 lump | sugar — loaf sugar | base |
| 0.5 glass | hot water — Half fill the glass with hot water to dissolve the sugar. | dilution |
- Dissolve the loaf sugar in hot water in a hot whiskey glass.
- Fill the glass with Scotch whiskey and serve.
This is a straightforward checkpoint for the sling branch surviving alongside fuller punch variants.
Its stripped-down hot build is the defining point.