A roll stuffed with slow-cooked meat goes down well at any party. If you prepare the meat in advance and need to reheat it, put it in a tray, wrap the tray in foil and place it in a barbecue to warm through. You may need to order the brisket ahead from your butcher. Begin this recipe a day ahead to marinate the meat.
Note Chinkiang vinegar is a black Chinese vinegar made from glutinous rice, water and salt. It's available from select Asian grocers; the Gold Plum brand is one of the best. Sambal belacan is roasted sambal infused with shrimp paste; it's available from select Asian grocers.