Slice the pork thinly.
Cut the vegetables (onion, carrot, green onion) into bite-size pieces.
Boil the buckwheat noodles in boiling water, then rinse with cold water.
Heat oil in a pan and stir-fry the pork.
When the pork is cooked, add the vegetables and stir-fry together.
Add the cooked buckwheat noodles, and season with sauce (soy sauce, sesame oil, pepper, etc.).
Mix everything well and stir-fry until done.