It's been a while since we rode the mezcal train, so let's begin with a brief primer. Actually, let's begin with a shot. Good. Now, on to the primer. Mezcal and tequila are sort of like langoustines and prawns: we’d bet a shiny nickel they’re different, but if pressed for an explanation we'd have to say they both basically taste like shrimp. Sombra Mezcal ($40) is made by baking the agave hearts in a conical pit lined with rocks that have been heated with an oak fire -- and its earthy, spicy taste is a great one to throw back.