In late November or early December, Korean families used to prepare enough kimchi to last the long winter. The kimchi was stored in large clay jars partially buried to maintain temperature and retain flavor. In modern Korea, housewives often don't have time to make kimchi or the outdoor space needed to store large amounts. But kimchi is still a vital part of the Korean lifestyle: companies making the fermented dish and others selling special kimchi refrigerators enjoy brisk sales.