Heat the oil in a cooking pot. Salt the meat, brown in batches for approx. 5 mins., remove.
Heat a dash of oil in the cooking pot. Sauté the onion, garlic and ginger for approx. 5 mins. Add the sugar and all the other ingredients up to and including the cinnamon stick, sauté briefly. Pour in the stock and soy sauce, bring to the boil, reduce the heat.
To boil the meat
Add the meat, leave to infuse just below the boil for approx. 1½ hrs. Remove the meat. Pour the stock through a sieve, pour back into the pan. Return the meat to the stock.
Add the pak choi and noodles to the soup, simmer for approx. 3 mins., stirring occasionally. Season the soup with salt, plate up, garnish with the coriander and fried onions.