Peel and finely dice the onion and garlic. Peel, wash and slice the carrots. Wash, clean and chop the leek. Heat oil in a pan and fry onion and garlic. Add vegetables and fry for about 5 minutes. Add minced meat and tomato paste and fry until golden brown.
Season with salt, pepper and paprika. Melt fat in a pot, add flour and sweat it for about 1 minute while stirring. Deglaze with milk and stock, bring to the boil and reduce to a thick consistency. Remove from heat, stir in lemon juice. Season with salt, pepper and 1 pinch of sugar. Cook the pasta in boiling salted water for about 2 minutes. Drain and let drain. Pour 1/3 of the lemon béchamel sauce on the bottom of an ovenproof casserole dish. Add 1/3 of the minced meat mixture. Turn the pasta into nests and place on top. Spread the minced meat mixture in the nests and pour the béchamel sauce in between.
Cook the pasta in boiling salted water for about 2 minutes. Drain and let drain. Pour 1/3 of the lemon béchamel sauce on the bottom of an ovenproof casserole dish. Add 1/3 of the minced meat mixture. Turn the pasta into nests and place on top. Spread the minced meat mixture in the nests and pour the béchamel sauce in between. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 15 minutes. Take out and serve immediately
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