You can’t rush a good cup of joe, and Jaho owner Anil Mezini has been slow-brewing his business for a decade. In 2005, the then-20-something opened his first gourmet coffee shop in Salem. A South End cafe came in 2011. Last summer, a sparkling flagship—Jaho Coffee Roaster & Wine Bar—debuted in a downtown high-rise. Specialty beans are now joined by beer flights, the prerequisite pastries by cheese and charcuterie boards. And his buzz just got bigger.