The espresso martini has had quite the run the past couple of years, and it's pretty ubiquitous at this point, but some bars put their hip into it. Case in point: Cosmo's, which starts with house-made Vietnamese coffee, a substantially richer elixir that packs a buzzy punch. The Vietnamese coffee is mixed with Van Gogh Espresso Vodka and Kahlua then tossed in a tumbler and shaken into a creamy smooth bliss. They only make a certain amount each day; when it's gone, it's gone, so go early.