There are so many dishes in the Greek kitchen that use unusual but completely natural ingredients as a substitute for meat. Walnuts for example, are often a replacement for ground meat in keftedes (meatballs) and even a few savory pies. This dish is part of the Vlachs cooking, a once-itinerant culture of shepherds who roamed the mountains of northern Greece and settled in areas around the Pindus range, Metsovo and lower into the valleys.