The Residents espresso martini is its most popular cocktail, made with a secret ingredient: ghee. | Residents Cafe & Bar There seems to be never-ending demand for the caffeine-packed cocktail Orders keep flowing in for the ever-popular espresso martini at D.C. bars, with no signs of slowing down any time soon. A few years ago, Eater sister site Punch did a deep dive on the timeless cocktail’s nationwide revival, noting its versatility at brunch, before dinner, or for dessert to stay alert and awake through last call. Around D.C., bartenders often tinker with recipes that go beyond the traditional combo of vodka, espresso, coffee liqueur, and simple syrup. Modernized versions loop in fresh chocolate shavings, hazelnut and walnut liqueurs, and more unexpected ingredients. Mr. Black, an intensely flavored Australian cold brew coffee liqueur, is the caffeine component of choice at several local bars. While there’s no shortage of well-executed espresso martinis around D.C., here are 15 recommendations to consider right now.