Trim the mushroom stems and tear them into strips. Slice the ham, onion, and green bell pepper. Blanch the ham briefly in boiling water.

Heat canola oil in a pan and sauté minced garlic until fragrant.

Add sliced onion and ham to the pan and stir-fry until lightly browned.

Add mushrooms and oyster sauce to the pan, stir-frying until mushrooms are tender.

Add green bell pepper and stir-fry briefly until slightly softened.

Turn off the heat, sprinkle sesame seeds and black pepper, and mix well.