Vefa Bozacısı is a historic bakery in Istanbul that specializes in boza, a traditional Turkish drink made from fermented grains. Boza has a thick, creamy texture and a slightly sour taste, and is often served with roasted chickpeas or nuts. Vefa Bozacısı has been in business since 1876 and is considered a cultural institution in Istanbul. In addition to boza, they also offer a variety of other traditional Turkish sweets and pastries.