Peel and chop the shallots. Wash tarragon, shake dry, pluck leaves from the stalks and chop. Prepare pasta in boiling salted water according to package instructions, drain and drain
Wash the fish, dab dry. Heat oil in a pan. Fry the fish for 6-7 minutes on the skin side, season with salt and pepper. Turn the fish, fry for about 1 minute more, take out, keep warm
Add the shallots to the hot frying fat and fry until transparent. Deglaze with cream and stock, bring to the boil and thicken with sauce thickener. Stir in tarragon and season to taste with salt, pepper and sugar. Arrange noodles with salmon and sauce on plates