Peel and wash the celery. Cut off about 1/4 of the celery and put it aside. Cut the rest of the celery into sticks. Peel and finely chop the onions. Cut bacon slices into thirds. Cook the pasta in boiling salted water according to the instructions on the packet, adding the piece of celery set aside
Coarsely chop the walnuts and roast them in a hot pan without fat, take them out. Heat the oil, fry the bacon in it until crispy, drain on kitchen paper. Fry celery sticks and onions in the frying fat. Sprinkle with sugar and let it caramelize slightly while stirring. Dust with flour and sauté briefly. Add cream and stock while stirring, let simmer for about 5 minutes
Wash parsley, dab dry and chop finely. Drain the pasta, let it drain, remove the celery. Season sauce with salt and pepper, mix in noodles. Mix in parsley and walnut kernels. Serve with bacon