Oh, in case you don't know: Sauerkraut is fermented cabbage. For a fairly detailed description of the procedure for making Sauerkraut take a look at Ohio State University's Factsheet for Making Fermented Vegetables. In practice, however, fermenting it yourself is not worth the trouble, just buy it ready-made in a supermarket.
Joachim is proud to be a Kraut, although he doesn't really care much about citizenship. Currently he lives in Canada, and he regards himself as a citizen of Planet Earth.