Slice the onion, carrot, and bell pepper into thin strips.
Boil the spaghetti noodles.
Heat cooking oil in a pan and stir-fry the pork.
Add the vegetables and stir-fry together.
Add the boiled spaghetti noodles and sauce (Worcestershire sauce, soy sauce, and a little sugar), then stir-fry.
Season with black pepper to taste and serve.