Put the mescal, lemon juice, simple syrup and egg white in a cocktail shaker and dry-shake (without ice) until frothy. Add ice to the shaker and vigorously shake. Strain into a chilled double-rocks glass. Garnish with ground cinnamon and nutmeg.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
Recipe courtesy of Geoffrey Zakarian