Mix 2 tablespoons each raw sugar and finely chopped dark chocolate on a plate. Combine 2 ounces each chocolate liqueur and vodka, 1 ounce chilled espresso, 1/2 teaspoon fresh orange juice and a strip of orange zest in a cocktail shaker with ice; stir well. Moisten the rim of a chilled martini glass and dip it in the sugar-chocolate mixture. Strain the cocktail into the glass and garnish with an orange wedge.
Photograph by Levi Brown