An agave-based old-fashioned with a wonderful hit of smokiness from the mezcal.
Like many cocktails, Philip's original recipe (of 45 ml Reposado tequila...
This is something quite special. Not a big tequila or mezcal drinker, making it more so. I did knock back the agave to 5ml for my palate, even with bob’s chocolate bitters. As Florian points out, easiest to dissolve agave in the spirits before adding ice.
One of my favorite cocktails - I really like the tequila/mezcal combo. I don't know if the chocolate bitters add much, and I do advocate for adding some saline solution (I added 5 drops) - think of it as a sub for a salted rim on a margarita.
Ever so slightly too sweet - read the comments before making. Would dial back the agave a touch to accommodate Fee Aztec bitters but otherwise a delicious sipper. A few grains of salt also lifted the flavour somewhat.
One of my all time favorite Old Fashioned riffs. Agave spirits are not usually my favorite, but in this application they shine. I also enjoy this with orange bitters, either instead of the chocolate or in addition to it.
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.
There's a reason this is a modern classic. A fantastic drink, although you need a robust tequila (or a mild mezcal) to keep the mezcal from dominating too much.
Agree with prior comment, much easier to stir agave syrup in with room temperature licores, then add ice cubes. No chocolate bitters, so used a few drops of our local Heritage Distilling Cocoa Bomb whiskey and a dash of orange bitters - delicioso for Dia de los Muertos!