Wash the cabbage thoroughly and cut into bite-sized pieces.
Julienne the carrot and onion as well.
Add cooking oil to a pan and heat over medium heat.
Add the onion and carrot first, and stir-fry for 1 minute.
Add the cabbage and season with salt and pepper.
Stir-fry for 3-4 minutes until the cabbage softens.
Transfer to a plate and serve.