Pour boiling water over noodles and leave for 4 to 5 minutes. Rinse in cold water, drain and set aside. Pound or blend shallot, chilli, belacan and shrimp powder to a fine paste. Heat oil in a hot wok and fry prawns for 1 minute. Remove prawns, then add paste and fry until it is fragrant. Reserve half the paste.
Add water, salt, sugar and oyster sauce to the wok and bring to the boil, s