For some reason, I feel the urge to investigate cooking in a clay pot (Romertopf or another brand, if there is such a thing), but I'd like some info first--are they worth the trouble? Are they hard to clean? What are the pros and cons? It seems they were all the rage many years ago, but I don't seem to see them in garage sales, so perhaps people still use and enjoy them. If so, I'd like to know why.