From Baking with Julia: "Throughout the Eastern Mediterranean, ka'kat are a staple--and satisfying--street food, seemingly available everywhere and anytime. Sesame-seed encrusted and sized for snacking, they're about two and a half inches across and reminiscent, if not in taste, then certainly in mood, of soft American pretzels. This bread is often flavored with mahleb, the ground kernels of a type of black cherry found in the region. Mahleb is available in Middle Eastern groceries, and a quarter teaspoon mixed into the dough will add an exotic aroma to the baked breads."