Gently fry the onion in butter, season with salt and pepper. Pour in the cream, crumble the cheese and bring the sauce to a boil. Stir frequently and let thicken a little over a low flame. Stir lemon zest, 1 dash of Worcestershire sauce, a tablespoon of mint and half of the salmon strips into the sauce. Season again with salt, pepper and Worcestershire sauce and, if necessary, add dried mint, as this usually has a more intense taste than the fresh one.
Cook the pasta in salted water until al dente. Mix with the sauce in the pan.
Garnish each serving with a few strips of salmon and fresh mint.