Really enjoyed this and it went perfectly for a cocktail with a very, very spicy Mexican dinner. I did find it a bit sweet, but it does seem to soften when the ice melts. May benefit from an addition of a little cold water and a long shake.
Slightly tweaked: substituted agave syrup and increased the bitters to 10 drops. Was harder to appreciate them at just 5.
But once modified, I love this version of a tequila old fashioned. Really taste the agave followed by a pleasant bit of heat from the bitters. Highly recommend!
After enjoying the Almond Old Fashioned, then came across this one with mole bitters. I subbed 2:1 syrup with agave nectar and increased the mole bitters to 10 drops to experiment. This is a great way to enjoy tequila and the three of a kind do work together here.