Wash the cabbage thoroughly and cut into bite-sized pieces.
Thinly slice the carrot and onion as well.
Heat cooking oil in a pan over medium heat.
Add the onion and carrot first and stir-fry for 1 minute.
Add the cabbage, season with salt and pepper.
Stir-fry for 3–5 minutes until the vegetables are wilted.
Add soy sauce or oyster sauce, stir-fry, and finish.