Begin by slicing the chicken thighs into strips.
In a bowl, combine the chicken with soy sauce, mirin, sesame oil, oyster sauce, ginger, cornstarch, and a small amount of water.
Mix all the ingredients thoroughly until well combined.
Add the chopped celery and mushrooms to the mixture and stir to incorporate.
Transfer everything into a blate, which is a hybrid of a bowl and a plate.
Steam the mixture on medium-low heat for 15 minutes.
Once done, serve the chicken and vegetables over a bed of fluffy white rice.
