Prepare macaroni in boiling salted water according to the instructions on the packet. Peel and finely chop the onion. Clean and wash soup vegetables. Peel celeriac and carrots, dice finely. Drain noodles, let them drain.
Heat the oil in a large pan or pot and fry the minced meat until crumbly. Add onion and soup vegetables and fry briefly. Add tomato puree and sauté. Deglaze with 250 ml water, bring to the boil.
Stir in the stock, simmer for 5 minutes at low heat. Wash, clean and halve the tomatoes. Add tomatoes and peas to the minced meat mixture and cook for 2-3 minutes. Season to taste with salt and pepper.
Whisk eggs and milk, season with salt and pepper. Grease a round casserole dish (26 cm Ø; 1.5 litre capacity). Layer macaroni and chopped sauce alternately in a circle. Pour the egg milk over it evenly.
Sprinkle everything with cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 35-40 minutes. Serve garnished with basil.