For beef & black bean soup, reduce the amount of noodles to 125 g (4 oz) and cook as above. Meanwhile, fry the spring onion then add the red chilli, ginger, black bean sauce and stock. Bring to the boil then add the green vegetables, soy sauce and sugar. Cook for 2 minutes as above. Quickly trim the fat off a 250 g (8 oz) sirloin steak, cut into thin slices and add to the soup. Cook for 2 more minutes then ladle into noodle filled bowls.