Cut the tenderloin into bite-sized pieces.
Prepare the bean sprouts, onion, and chives.
Boil the noodles in boiling water, then rinse them with cold water.
Heat oil in a pan and stir-fry the tenderloin.
Add onion, bean sprouts, and chives in order, and stir-fry.
Add the cooked noodles and sauce, then quickly stir-fry together.
Finish by sprinkling crushed peanuts and lime juice.