Keep the Yeni Camii on your right and turn after about 100 meters into the Spice Bazaar. It was built to provide rent for the upkeep of the Yeni Camii. It's also called the Egyptian Bazaar due to the fact that the spices came from India and South-East Asia via Egypt. The Venetians traded spices here in the 13th century already. It's a pity that that Spice Bazaar is going a bit the way of a tourist rarity, however spices are still sold as well as special Turkish things.
Honey seems to be favourite.
Here Istanbul's two best coffee roasters have their base, just turn left outside the bazaar's door's. When you like Turkish Coffee you might wonder which of the two coffee roasters is the best. Since we are coffee lovers ourselves and have a modest knowledge about coffee I can assure you that Ihsan Kurukahvecioglu Halefleri is the best of the two. Ihsan Kurukahvecioglu Halefleri address is Tahmis Caddesi Kurukahveci Hani Altinda - Eminonu. Knowledge about coffee is on the same level as wine and cigars.