Cook the pasta in boiling salted water for about 10 minutes until al dente (cook the ribbon noodles later and serve with the ragout). Wash the meat, dab dry and cut into small cubes.
Peel and finely chop the onion. Heat the fat and fry the meat and onions in it while turning. Sprinkle with flour, sauté briefly and deglaze with wine and cream. Bring to the boil and season to taste with lemon juice, salt and pepper.
Melt the parmesan cheese in the ragout. Fill the pasta with the ragout. Serve the rest in the form. Garnish with lemon slices and lemon balm. Serve with green salad.