Sour Sauce (Jigchow) A good quality sour sauce used to add a sour taste to table dishes such as shark fin stew fish maw or as a dipping sauce to add delicious flavor to afternoon snacks such as dim sum har gow steamed buns dumplings and rice noodle rolls. - Name: DEK SOM BOON Black Vinegar 600 ml x 3 - Brand: DEK SOM BOON - Unit Amount: 3 unit(s) How to Preserve: Store in a cool, dry place away from direct sunlight. Close the lid tightly after opening.