As versatile as ketchup, this smoky, sweet, and savory condiment known as ajvar was adapted from one served at Tim Wiechmann’s now-defunct Playska, a Balkan-style sandwich shop in Cambridge, Massachusetts. Featured in: “International Schmear: The Ketchup and Mayo of the Balkans.” Roasted Red Pepper and Eggplant Sauce (Ajvar) This Balkan spread is a smoky, sweet and savory condiment as versatile as ketchup.