Cut the zucchini and onion into bite-sized pieces.
Thinly slice the green onion.
Heat some cooking oil in a pan and stir-fry the green onion to make scallion oil.
Add the onion and cook until it becomes translucent.
Add the zucchini and stir-fry with a pinch of salt.
Once the zucchini is cooked, add soy sauce and sesame oil, and mix well.
Spoon the stir-fried zucchini over steamed rice.
Sprinkle with sesame seeds to finish.