Add half a block of tofu to a preheated pan, crumble it, and stir-fry.
Cut the thick lower part of cabbage including the core, then finely chop it with a chopper.
Set aside the tofu crumble on a plate after its moisture evaporates. Add olive oil to the pan, then add the chopped cabbage and stir-fry.
Once the cabbage is cooked, add the tofu crumble back into the pan and stir in half a spoon of soy sauce.
Add 1/3 spoon of oyster sauce and continue stir-frying.
Turn off the heat and sprinkle a little bit of pepper.