Cu, pronounced "tsu", is a condiment from the North of China. Normally, it is used as dip for dumplings or, with finely sliced scallion added, for spring rolls. Try adding a bit of honey for extra sweetness or some finely grated ginger for freshness. Apart from the traditional uses, cu can be used with steamed fish, for tempura, as a dressing on salads, or with steamed vegetables.

Cu can keep for several weeks in the refrigerator in a covered container.

• 1/2 cup (1 dl) tamari
• 1/2 cup (1 dl) brown rice vinegar or unfiltered cider vinegar