This is super tasty and really very fast to make after a busy day at work, so long as you remember to get the duck breasts in to marinate the night before anyway. This feeds two greedy adults and is an almost direct go at the Ching He Huang recipe from Chinese Food Made Easy, which is well worth a watch or peruse if you like a Chinese dinner now and then.
So, you'll need to start with your two duck breasts and a sealie bag. Stick the following things into the baggie and mush it up a bit: tsp ground five-spice, tbsp sesame oil, 3 tbsp hoisin sauce, 1-2 tbsp soft brown sugar, 3 tbsp water, 1 tbsp dark soy sauce. Add the duck, seal up and bung in a bowl in the fridge until tomorrow dinnertime.
Next day, get the oven on at 200°C and pat down the duck breasts (throw away the marinade). Pan fry them in a dry pan on a high heat for a couple of minutes either side, then put in a baking tray (skin up) and roast for 15 minutes or so.
While they're roasting get a litre of chicken stock on the hob and bring to a simmer. Add a tablespoon each of shaoxing rice wine (or sherry), soy sauce and rice vinegar (or any vinegar).
At the same time put some noodles on to cook, they should only take a few minutes. When they're done drain them and hold them under the cold tap for a bit to stop them going soggy.
Add some shitake mushrooms and sliced spring greens or cabbage to the soup and cook for a few minutes.
Take the duck breasts out of the oven and rest on a cold plate for at least 5 minutes, before slicing. Add the noodles, some sliced spring onion and chopped coriander to the hot soup, lay the duck slices on the top and garnish with thin slices of green chilli.