Kurukahveci Mehmet Efendi, the phenomenal 141-year-old Turkish coffee purveyor, is located in a weather-beaten deco building just outside of Istanbul's Spice Market. Through its street-front window, thousands of brown wax-paper packets of freshly ground coffee are sold each day. The beans are roasted on the premises and then ground as finely as cake flour in belt-driven mills that chug away from morning to night. Taken home and brewed the traditional Turkish way—brought to a boil with water and sugar in a long-handled pot called a cezve—Kurukahveci Mehmet Efendi coffee is the boldest, ballsiest you'll ever taste.