Mix all the sauce ingredients together in a pan and boil until reduced to about 2/3 cup. Set aside to cool. Heat the oil in a wok or pan until very hot, then add the prawns and bean curd and stir-fry lightly for 1 minute. Add the preserved radish and shallot, fry for 1 minute, and break in the eggs. Stir-fry for a minute, then add the noodles and chicken stock. When the noodles are soft (about 2 minutes), add the dried shrimps, peanuts, spring onions and bean sprouts. Add the sauce, fry for a couple of minutes and serve. Serve accompanied by chopped peanuts, chopped dry chillies, sugar, lime wedges, spring onions, and fresh bean sprouts, all in small containers.