Combine all the spicy sauce ingredients and set aside.
Cook the noodles in a large pan of boiling water, according to the packet instructions. Refresh in cold running water, then drain and toss into a bowl with the sesame oil.
Heat the groundnut oil in a wok over a high heat until the oil starts to shimmer. Add the garlic, ginger, onion and chilli and give the ingredients a good stir. Tip in the mushrooms and stir-fry for 1 minute, then add the ham, prawns, peas and bean sprouts. Stir for 1 minute.
Pour in the prepared sauce and toss well to combine, then stir in the cooked noodles, spring onions and coriander. Stir until the noodles are heated through, then serve.