In a pot of boiling water add spaghetti along with a generous pinch of salt. Cook until pasta is soft.
In a bowl combine salmon pieces, Dijon mustard, crème fraiche, lemon juice, ½ diced red onion, capers and chili flakes.
Once the pasta is cooked, remove from the heat and strain. Return to the pot along with lemon oil. Add in the salmon mixture and mix together.
Serve with fresh dill and remaining red onion