Espresso martinis have been one of the biggest cocktail drink trends of recent years, and given our love of coffee, it’s a drink that we have been wanting to put our own spin on. My co-author, Dan Q. Dao, a former bartender, collaborated with us to create a 100-percent Vietnamese cocktail made with a stunning Vietnamese gin, from the pioneering Hanoi-based Sông Cái Distillery, and Vietnamese coffee, from a roaster like Nam Coffee, brewed the traditional way in a stainless s