Cook the pasta in plenty of salted water until al dente.
Wash the leek, carrots, broccoli, chilli pepper, ginger and garlic and cut into thin slices.
Heat some oil in a large pan or wok and fry the vegetables in it. Add about two ladles of pasta water. Add the ginger and garlic. When the vegetables are cooked but still firm to the bite, add the noodles, mix everything and season with pepper and soy sauce.