Defrost peas at room temperature for about 15 minutes. Soak rolls in cold water. Wash the potatoes thoroughly, wrap them in foil, place them on a cake tray and bake them on the lower shelf in a preheated oven (electric range: 175 °C / gas: level 2) for 1 hour.
Drain the corn. Peel and chop the onions. Wash, quarter, seed and dice the tomatoes. Knead minced meat, eggs, squeezed rolls, mustard, salt, pepper, paprika and onions with the dough hooks of the hand mixer.
Knead in peas, tomatoes and corn. Spread the minced dough in a greased casserole dish (approx. 26 cm x 39 cm). After about 15 minutes, place on a cake rack and slide over the potato tray.
Bake for the remaining 45 minutes. In the meantime, drain the mozzarella and cut into cubes. Clean and wash spring onions and cut into small rolls. Then mix with sour cream and quark. Season with salt and pepper and sprinkle with remaining spring onion rings.
Place the mozzarella cubes on the minced cake about 10 minutes before the end of the baking time. Serve one piece of minced cake and one potato with Schmand-quark on each plate. Garnish the minced cake with basil as desired.