Serve the prepared bok choy and mushrooms over rice.
Wash the bok choy thoroughly and cut into bite-sized pieces.
Dice the pork and shrimp into small pieces, and julienne the onion and carrot.
Heat cooking oil in a pan and sauté the pork and shrimp.
Add onion and carrot, and stir-fry together.
Add bok choy and continue stir-frying.
Season with oyster sauce, soy sauce, sugar, and pepper.
Add water and starch slurry to adjust the thickness.
Finish the dish by placing the stir-fried ingredients over rice.