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Boil the spaghetti for 12 mins until al dente, adding the asparagus for the last 3 mins. Meanwhile, heat the oil in a large non-stick frying pan, add the leeks and chilli and cook for 5 mins. Stir in the garlic, peas and lemon zest and juice and cook for a few mins more.
Drain and add the pasta to the pan with ¼ mug of the pasta water and toss everything together until well mixed. Spoon into shallow bowls and serve with lemon wedges for squeezing over, if you like.