Drop the noodles into a large bowl, then pour over enough boiling water to cover. Tip in the sliced sugar snaps and leave for 4 minutes. Drain in a colander, put under cold running water to cool off, then drain again. Tip into a bowl and toss in the sesame oil.
Mix the dressing ingredients. Pile spring onions, coriander and salmon onto the noodles, pour over the dressing and toss everything together. Serve with a pretzel or bread roll.