Heat up the cooking oil in a wok and stir fry the ginger strips until aromatic. Add in the red onion and black fungus and do a few quick stirs.
Add the fermented soy bean before adding the chicken strips into the wok. Stir-fry the chicken until the surface turns white.
Add in oyster sauce, sweet soy sauce (kecap manis) and sugar. Stir all ingredients together before adding the water. Add the scallions, do a few quick stirs, dish out and serve hot with steamed rice.
Notes
Black fungus is also called "cloud ear" (云耳) or "wood ear" (木耳).