Pioppino are a type of Japanese mushroom. They are also known as black poplar mushrooms and shimeji. Black fungus are also known as wood ear mushrooms. You will find both types of mushrooms in Chinese/Oriental speciality stores.
If you'd like a thicker sauce, add a little bit of cornflour mixed with water at the end.
This dish was a surprising treat. I shall make this often. I used other mushrooms and veg and even noodles. A really lovely way to use oyster sauce and soy sauce to produce subtle flavours. - 23 May 2017
really quick and easy, lovely dish. I used ordinary mushrooms cuz that's all I had. Would def recommend also added green pepper and sliced carrot - 21 May 2015