Soak porcini mushrooms in 1/4 l warm water. Cook the pasta in boiling salted water for 8-10 minutes until al dente. Clean, wash and divide Romanesco into florets. Steam in boiling salted water for about 8 minutes. Drain pasta and Romanesco
Peel and chop the onion. Clean, wash and halve the mushrooms. Heat clarified butter. Fry onion and mushrooms. Stir in porcini mushrooms together with water and cream, bring to the boil. Season to taste with salt and pepper
Wash the thyme, pluck off the leaves and stir into the mushroom cream. Spread the pasta and romanesco in a large greased casserole dish. Pour cream of mushroom over it and sprinkle with cheese. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 20 minutes