Long-Cooked Pork Belly with Preserved Mustard

This pork dish is equally well known and important in Beijing, Shanghai, Suzhou, Hangzhou, and Guangzhou and is a particular specialty of the Hakka, who are Han Chinese believed to have migrated from northern China to the south centuries ago (see “Cuisines of the Chiu Chow and the Hakka”). It is called meicai kourou (or mui choi kau yuk in Cantonese) and involves a two-method cooking process that calls for long-cooking, or braising, followed