It is very easy to make the perfect sauce in which to dip your dumplings. I tried several different approaches and was thrilled when the easiest prevailed as the tastiest. It is all about the salty/sweet/sour balance. You can add chili oil for heat as well, but I think the salty soy sauce, the sour vinegar and a tiny bit of sweetness from sugar are key.   It is as simple as whisking ingredients together in a bowl. And because it is so easy, you can make it last minute, or make it way ahead and have it in the fridge, waiting for you.