Wash the salmon and dab dry. Cut into portion pieces. Sprinkle with lemon juice, season with salt and let stand. In the meantime, clean and wash the mangetouts and cut them in half lengthwise. Cook in boiling salted water for about 8 minutes.
Fry the salmon briefly in hot oil. Deglaze with 100 ml white wine. Add 1/4 litre of water, bring to the boil briefly and cook over medium heat for about 5 minutes. For the sauce heat 1/8 litre water and saffron. Stir in sauce powder, bring to the boil. Stir in butter cut into small pieces and fold in at low heat. Refine with 50 ml white wine. Pluck the chervil leaves. Mix with the mangetouts.
Stir in sauce powder, bring to the boil. Stir in butter cut into small pieces and fold in at low heat. Refine with 50 ml white wine. Pluck the chervil leaves. Mix with the mangetouts. Serve salmon, vegetables and sauce in portions, garnished with lemon and chervil.