1/2 ounce agave nectar, plus more for rimming the glass
Black lava salt, for rimming the glass
1 1/4 ounces tequila
1/2 ounce fresh lime juice, plus 1 lime wedge, for garnish
1/4 ounce mezcal
1 large egg white, optional
Eggs whites have been used in cocktails for hundreds of years. While they do not add significantly to the flavor, they provide a wonderful creamy texture. For those concerned about food-borne illness, use pasteurized egg whites from a small carton. Always check the expiration date and once the carton is opened, do not reuse.