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Cook the spaghetti for 10 mins or following pack instructions until al dente.
Meanwhile, heat the oil in a wok or large frying pan and briefly fry the chilli to soften it.
Drain the spaghetti, reserving a little of the water, then tip into the wok and, using 2 wooden spoons, toss in the chilli oil until well mixed. Add the salmon, lemon zest and chives or onions, then toss again. Season and add lemon juice to taste.