Cook 200 g pasta in salted water on medium-high heat until al dente. Drain and set aside.
Season 300 g minced meat with the Chinese spice mixture. Heat a pan over medium-high heat and fry the meat for 5-8 minutes, stirring and breaking it up with a spoon until browned.
While the meat fries, wash the leek and slice it using the light green and white parts. Wipe and slice the mushrooms. Dice the onion. Add all vegetables to the pan and fry for 3-5 minutes over medium-high heat, stirring occasionally.
Add the cooked pasta to the pan. Season everything with soy sauce to taste.