In a mixing glass, stir together:
- 1 ounce of mezcal
- 1 ounce of smoky blended Scotch (like the Black Grouse)
- 1/4 ounce of agave syrup (light agave dissolved in an equal amount of hot water)
- a dash of orange bitters
Strain into a rocks glass over fresh ice.
Squeeze a big grapefruit peel over the top, then add it to the drink as a garnish.