From turkishcooking.com. The website indicates this sauce is used for a condiment on shish kebabs but I served it as a salsa with slices of toasted French bread. Be sure the tomatoes you use are top quality! If you cannot find good quality tomatoes, go ahead and used diced canned. Try different chili peppers such as Thai, habanero, etc. DO NOT omit the sumac as it is integral to the recipe. ;)