If you happen to come across one of these guys while wandering around Athens or Thessaloniki then I pledge you to stop and buy one koulouri. Actually, a koulouri is a round bread with loads of sesame on the outside. The easiest and cheapest way to tame your appetite whilst on the street.
P.s. Magda has a few more information about koulouri as well as a recipe to make it at home.
Image by Nate Gray.