Slice the vegetables thinly and fry them in the butter in a medium-sized pot. When the vegetables have been fried, reduce the heat and put in the cheese and oregano. Let it simmer, while the salmon is fried and add the apple juice, white wine or water.
Season the pieces of salmon with salt and pepper and fry them in oil or butter on the pan for 15 minutes.
Cook the spaghetti as directed on the packaging.
Cut the smoked salmon into little pieces and put it into the sauce immediately before serving.
Strain the water from the spaghetti and mix the spaghetti into the sauce.
You can sprinkle parsley, grated parmesan or other grated cheese on top.
Serve with baguettes.