Place the pork mince, cabbage, sesame oil, soy sauce, ginger and garlic in a bowl and stir to thoroughly combine.
Place the wrappers on a chopping board or clean bench. To make the dumplings, spoon 1 heaped teaspoon of the mince mixture onto one side of the wrapper and brush the edges with cold water. Fold the other half of the wrapper over and pinch the sides together to seal it.
Place the dumplings in a well-oiled steamer basket and steam for about 15 minutes. Once they're cooked, sear one side of each one in a hot fry-pan until crispy.
To make the sauce, mix the two ingredients together.