Cut pretzel into fine slices, roast colourless in a pan without fat at low heat, take out, let cool
Meanwhile wash the meat, dab dry and cut into strips. Heat the oil in a large pan. Fry the meat for 5-6 minutes while turning, season with salt and pepper and remove. Peel and finely dice the onions. Grate cheese finely. Prepare pasta in boiling salted water according to package instructions
Melt 40 g fat in a pot. Fry the onions in it until transparent. Sprinkle with flour and sauté while stirring. Gradually deglaze with milk, bringing to the boil while stirring constantly. Let simmer for 2-3 minutes while stirring. Add cheese, up to 50 g, and tomato paste, dissolve while stirring constantly.
Season the sauce to taste with salt, pepper and vinegar. Pour the pasta into a sieve, drain and add to the sauce with the meat. Put them into four small or 1 large greased casserole dish, sprinkle with the remaining cheese. Coarsely grind the pretzel in the universal chopper, knead with 20 g fat and spread on the noodles. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 20 minutes