Combine all the Sauce ingredients in a bowl, stir to mix well. Set aside.
Heat up a Chinese claypot on high heat. (You may use a skillet or wok.)
Add the oil into the claypot. When the oil is heated, add the ginger and stir fry until aromatic. Add the chicken and stir continuously until the meat turns opaque.
Add the black fungus, stir to combine well. Add the sauce, stir to coat well with the chicken. Turn the heat to low, cover the pot and simmer on low heat, for about 10 minutes, or until the chicken has become tender. If the sauce dries up, add some water to dilute the sauce. Right before serving, stir in the scallions. Serve warm with steamed rice.
Notes
If you don't like black fungus, you can substitute with dried or fresh shiitake mushrooms.