Many smaller things like, "Meals: Poor meals might be composed of bread, baked turnips, onions, and water. Common meals might consist of bread, chicken stew (easy on the chicken), carrots, and watered-down ale. Good meals might be composed of bread and pastries, beef, peas, and ale or wine." (PHB3.5 p131) This lets us know that the assumption isn't asian (no rice), isn't american (corn, squash, peppers, potatoes), isn't african (yams, cassava), isn't middle eastern (hummus, flatbreads, olives). Again, the assumed is european.