You're going to need some mezcal to act as a "hair of the dog" on New Year's Day. Hence the Bitter Truth brunch cocktail at Belly's Wine Bar, made with Del Maguey’s Vida mezcal and Bitterman's Xocolatl Mole bitters.
Combine all ingredients besides salt in an ice filled rocks glass. Stir. Garnish with oil from lemon swath and pinch of salt.