Cook the pasta according to the instructions.
Meanwhile, cook the peas and asparagus in boiling water for 1 minute. Drain.
Put the crème fraiche into a pan and heat gently, but don't boil. Add the spring onion, salmon, peas and asparagus and heat until everything is warmed through. Season.
Drain the spaghetti and return to the pan. Pour over the sauce and toss well together. Serve immediately in warm bowls.
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