Cut cabbage and tofu into bite-sized pieces.
Julienne the onion and carrot.
Heat cooking oil in a pan and stir-fry the onion and carrot.
Add the cabbage and stir-fry.
Add the tofu, crumble it, and stir-fry together.
Season with soy sauce, sugar, and pepper.
Serve the stir-fried ingredients on top of rice to finish.