Peel and finely dice the onions. Peel garlic. Heat oil in a pot and sauté onions until golden brown. Press garlic through the garlic press into the pan, add minced meat and fry.
Dust with flour and add tomatoes. Mash tomatoes and simmer covered for about 30 minutes. Meanwhile wash and clean the celery and cut into small cubes. Halve the savoy cabbage, remove the outer leaves and stalk.
Cut the savoy cabbage into finger-thick strips. Add the celery and savoy cabbage to the Bolognese about 10 minutes before the end of the cooking time and cook in it. Cook the pasta in boiling salted water for about 8 minutes until it is firm to the bite.
Meanwhile, wash the thyme, dab dry and, except for something to garnish, pluck off the thyme. Add thyme to the bolognese and season with salt and pepper. Drain the pasta, mix with the savoy cabbage bolognese and serve in deep plates.
Garnish with remaining thyme.