Heat a wok over medium high heat with enough oil to lightly coat the surface of the wok. Once you see ripples in the oil, add the sliced mushrooms. Spread them around the wok to get a good surface area to cook each. Add a pinch of salt over the mushrooms.
The mushrooms will start to release water as these cook in the heat. Leave untouched until you start to get browning around the edges of the mushrooms.
Flip or move around the mushrooms to get browning on the remaining sides.
Once the mushrooms have a nice sear and are cooked (no more signs of excess water/moisture in the wok), remove these from the wok and set aside.
In the same wok over medium heat, add more oil to lightly coat the surface of the wok.
Add in the ginger, garlic, shallots, and white parts of the scallion. Stir-fry for 30 seconds until aromatic. Add the Sichuan peppercorn and mix with the aromatics. Cook for 30 seconds.
Drain the lotus roots from the water. Carefully add into the wok. Spread the lotus root apart to get good surface area for cooking
Leave to cook for 1-2 minutes or each side to cook. I like a good bite and crunch on mine!
Pour in the sauce and lower the heat to medium.
Add the king oyster mushrooms and mix well to combine everything. The sauce will start to thicken from the sugars.
Add a splash of water to deglaze the wok.
Taste the lotus root and cook for 2-3 more minutes depending on your desired texture.