Famous New Orleans Drinks and How to Mix 'Em by Stanley Clisby Arthur (1938, p.75)

1.5 jiggerDubonnet — Dubonnet winebase
1.5 jiggerFrench vermouth — Float on top; do not mix.modifier
  1. Pour the chilled Dubonnet into a wine or flip glass.
  2. Float the French vermouth skillfully on top without mixing and serve.