Peel and finely chop the onion. Peel the garlic and press it through a garlic press. Wash parsley, dab dry and chop finely. Heat oil in a pan and fry minced meat in it while turning. Add the onions and garlic and fry. Deglaze minced meat with tomatoes and wine.
Season to taste with salt, pepper and sugar, add 3/4 of the parsley and let everything simmer for about 5 minutes. Meanwhile cook the noodles in boiling salted water for about 10 minutes. Separate two eggs. Remove the minced sauce from the heat and stir in the egg white. Grate cheese. Heat fat in a pot and sweat flour in it. Deglaze with stock and milk, bring to the boil while stirring constantly and season to taste with salt, pepper and nutmeg. Melt half of the cheese in the sauce. Remove the sauce from the heat, stir the remaining egg and egg yolk into the sauce as well and do not boil any more. Drain the pasta, rinse with cold water and drain. Put half of the pasta into a greased, ovenproof dish and sprinkle with half of the remaining cheese. Spread the minced meat mixture on top, add the rest of the pasta and pour the sauce over it.
Deglaze with stock and milk, bring to the boil while stirring constantly and season to taste with salt, pepper and nutmeg. Melt half of the cheese in the sauce. Remove the sauce from the heat, stir the remaining egg and egg yolk into the sauce as well and do not boil any more. Drain the pasta, rinse with cold water and drain. Put half of the pasta into a greased, ovenproof dish and sprinkle with half of the remaining cheese. Spread the minced meat mixture on top, add the rest of the pasta and pour the sauce over it. Sprinkle with remaining cheese and bake in the preheated oven (electric oven: 200°C/ gas: level 3) for about 40 minutes. Sprinkle casserole with remaining parsley and serve garnished with mint leaves as desired