Wash the asparagus, cut off the woody ends. Cut the asparagus lengthwise into thin strips with the asparagus peeler. Wash and dry 1 lemon and grate the peel thinly. Peel the garlic.
Finely chop garlic, lemon peel and tarragon leaves. Wash the fish fillets, dab dry, pull out any bones and slightly cut the surface of the skin side with a sharp knife 3 times.
Season fillets on both sides with salt. Prepare ribbon noodles in boiling salted water according to package instructions. Bring cream to the boil in a small pot. Add lobster butter and cognac and season to taste with salt and pepper.
Drain the ribbon noodles. Melt 1 teaspoon butter in a large pan and briefly cook the asparagus strips in it. Add the noodles, mix, cover and set aside. Wash 1 lemon, rub dry and cut into slices.
Heat oil in a pan and fry fish fillets in 2 portions, first from the skin side for 2-3 minutes. Then turn, fry for 1 minute and take out. Bring the sauce to the boil again and add 1 teaspoon of butter.
Immediately foam up with the blender. Turn the pasta and asparagus into turrets with a meat fork and place them on a plate. Add the fish fillets and sprinkle with the lemon mix. Serve with the cognac froth and lemon slices.