Notes: Dried shiitake and wood ears can be found at most Asian grocers. You can feel free to omit one, making up the difference with more of the other. If you can't find dried mushrooms, use fresh sliced shiitake or button mushrooms, omitting step 1 and increasing stock to 2 quarts. Chinkiang or red vinegar can be found at most Asian markets. If you can't find it, regular rice wine vinegar or distilled vinegar with a splash of balsamic vinegar may be substituted.