Boil up plenty of salted water. Peel and wash the celery and cut it into sticks. Peel and finely chop the onions. Cut bacon slices into thirds. Cook the pasta in boiling salted water for about 10 minutes until al dente.
Coarsely chop the walnuts and roast them in a coated pan. Remove. Heat the oil in the pan. Fry the bacon until crispy. Take out.
Sauté the celery and onions in hot frying fat. Sprinkle with 1 tbsp. sugar and caramelise lightly while stirring. Dust with flour and sauté briefly. 1⁄4 l Pour on water and cream, bring to the boil and stir in stock.
Continue cooking for about 5 minutes.
Wash and finely chop the parsley. Drain the pasta, let it drain and mix with the sauce. Season everything with salt and pepper. Fold in walnut kernels. Sprinkle with parsley and bacon.