Peel and finely chop the onion. Clean, peel, wash and cut the vegetables into very small cubes. Peel garlic and chop finely
Heat the oil in a coated pan. Fry the minced meat, carrot and celery cubes for about 8 minutes. Season with salt and pepper. After about 6 minutes add onions and garlic. Stir in tomato paste and fry briefly. Deglaze with stock and tomatoes. Cover and let simmer for another 20 minutes
Wash the thyme, shake dry and finely chop 2/3 of the leaves. Cook the pasta in boiling salted water according to the instructions on the packet. Cut toast into small cubes. Put the slices of toast into a small coated pan and roast them in it while swiveling occasionally, take them out
Add the chopped thyme to the sauce and season to taste again. Drain the pasta and mix with the sauce. Arrange the noodles on plates, sprinkle with croutons and garnish with the remaining thyme