Boil the vinegar together with the water, onions and spices, then let it cool down and pour it over the meat. Marinate for about two weeks
Remove the meat from the marinade, dry well, flour lightly and roast all around in a roaster. Fry the drained onions in the same pan and add the boiled marinade 2-3 times. Add the meat, add the rest of the marinade, cover and braise at 160 °C for 1.5 to 2 hours. Cut out the soft meat, reduce the sauce to the desired consistency and strain
Bring milk and cream to the boil with 10 sprigs of thyme. Salt it, let it stand and pass it through a fine sieve. Stir in the polenta semolina and let it swell for at least 30 minutes
Pluck the rest of the thyme and mix it with lemon zest and olive oil. Pour a tablespoon of each over the polenta
Remove the stalk from the radicchio, pluck it small and soak in warm water for about 1 hour. Brown the butter in a shallow saucepan, sauté the drained radicchio briefly in it, season to taste with salt, sugar and lime juice.
Briefly mix in the finely chopped Amarettini and serve immediately.