WhiteTie Bartending
Barkeeper at Santos Cocktailbar
One of my favorite Old Fashioneds, before I first recogniced this one, had invented a similar recipe for myself with 3cl tequila and 3cl mezcal with a dash of salt solution and grapefruit bitters instead of Angostura or Chocolate. Even in the official 4.5 to 1.5 I prefer to use grapefruit bitters and a dash of salt solution.