We should separate as terumah a whole small onion and not half a large onion. Rabbi Yehudah says: It is not so! Rather, [one should separate as terumah] half a large onion. And similarly Rabbi Yehudah was wont to say: We separate the onions of city dwellers as terumah on behalf of the onions of villagers, but not the onions of villagers on behalf of the onions of city dwellers, because [the onions of city dwellers] are food of the nobility.