Dry sherry is the best substitute for Shao Xing rice wine. Rice vinegar alone would make this dish too acidic. For a non-alcoholic substitute, use chicken or veggie stock and add a small pinch of brown sugar and a little rice vinegar to yield a similar savory-sweet flavor profile. Mirin (a sweet Japanese cooking wine) can also be substituted, but omit the white sugar in the recipe if using it.