Recipes for Mixed Drinks by Hugo R. Ensslin (1917, p.12) — Golden
| Bronx Cocktail — Made same as Bronx. | base | |
| 1 yolk | egg yolk — Egg Yolk | other |
- Make as a Bronx Cocktail, adding the yolk of an egg.
- Shake and serve.
Ice: Cracked ice
This matters because it shows the Bronx family branching into named egg-texture variants rather than remaining a single formula.
The yolk shifts the texture and service identity while preserving the underlying Bronx structure.