Caffeine addiction is for the nocturnal college student and the harried professional. Or the jilted lover, if you take jazz singer Sarah Vaughan's words: "My nerves have gone to pieces. My hair is turning gray. All I do is drink black coffee since my man's gone away." With its two locations in Deep Ellum and Highland Park, San Antonio-imported Merit Coffee washes away its "third wave" competitors, delivering superior java for whomever craves it. Represented by a train conductor's presentation lantern, it illuminates a way forward in Dallas. By directly sourcing beans from farmers and roasting them to perfection, Merit serves up memorable espresso like "La Falda" from Colombia, with tasting notes of red apple, marshmallow and cocoa powder, or filter coffee like "Larcho Torka" from Ethiopia, with tasting notes of lemongrass, star fruit and raspberry.