Heat chicken soup in a pot. Quarter the bell pepper, clean, wash and cut crosswise into thin strips. Add to the stock and cook for about 10 minutes. Cook the noodles in plenty of salted water for 4-5 minutes.
Clean the leek, cut into thin rings and wash thoroughly. Drain the bean sprouts. Wash the meat, dab dry and cut into thin slices. Heat the fat in a pan and fry the meat in it.
Add leek, meat and bean sprouts to the stock and cook for another 5 minutes. Add the noodles and heat them up. Season soup with salt and pepper and serve with soy sauce and sambal oelek.