Wash the chicken filet and dab dry. Fry in 1 tablespoon of hot oil while turning for about 12 minutes. Season with salt and pepper. Then cut into pieces. Put the noodles in boiling salted water.
Cook for about 10 minutes, then drain. In the meantime, sort and wash the spinach. Cut the gorgonzola into thin slices and chop the walnuts. Mix the prepared ingredients carefully. For the marinade, peel onions and cut them into thin rings.
Warm the lemon juice and vinegar. Heat onion rings in it. Season with salt, pepper and sugar. Add remaining oil and spread over the salad.