Fill the gratin into a gratin dish without defrosting and bake in a preheated oven (electric: 200 °C/ gas: level 3) for approx. 25 minutes. In the meantime, peel and finely chop the onion. Knead minced meat, onion, curd cheese and breadcrumbs, season with salt, pepper and paprika and form small balls. Heat oil in a pan and fry the meatballs in it for 4-5 minutes until golden brown. 10 minutes before the end of the cooking time, spread on the gratin. Sprinkle with cheese and gratinate. Sprinkle with paprika cubes n as desired and serve garnished with parsley