Wash the zucchini thoroughly and julienne it.
Slice the onion and green onion thinly.
Boil the noodles and rinse in cold water.
Heat cooking oil in a pan and sauté the green onion until fragrant.
Add zucchini and onion, and stir-fry together.
Pour in soy sauce and water, and bring to a boil.
Add the noodles to the boiling broth and cook for 1 more minute.
Serve in a bowl and sprinkle pepper and sesame seeds to finish.