Bring the water with a little granular stock to the boil and cook the cauliflower in it for about 5 - 10 minutes (but not too long, otherwise it will be too soft).
Cook the tortellini according to the instructions on the packet.
Melt the butter in a pan, gradually stir in the flour. Deglaze with the milk and bring to the boil once. Then season with nutmeg, pepper, salt, broth and paprika powder (if you like it a little hotter, you can also add cayenne pepper).
Put the tortellini in a baking dish, spread the cauliflower over it. Then pour the sauce over it and cover or sprinkle with cheese.
Then put in the oven and bake for another 10-15 minutes. Serve hot.