Cook the tortelloni according to the instructions on the packet.
Slowly toast the ham brown in a pan with a little vegetable oil. Roast the tomato paste briefly and then deglaze with the milk. Add the stock and thyme and bring to the boil for a few minutes. Press the garlic into the pan and cook it briefly.
Mix the cream, egg yolk and parmesan with a whisk and season with salt, pepper and grated nutmeg.
Add the cooked tortelloni to the ham sauce, stir vigorously and stir in the cream / egg yolk / parmesan mixture. Heat gently until it comes to a boil. The sauce will soon become thick while stirring. Remove from the heat and finally sprinkle with the freshly cut parsley and serve hot.