Soak rolls in cold water. Squeeze well and knead with ground pork and egg. Season with paprika. Clean the savoy cabbage. Separate the outer leaves (6-8 pieces), cut the stalk flat and blanch in boiling water for about 2 minutes.
Cut approx. 150 g savoy cabbage into strips and add to the minced meat. Remove the savoy cabbage leaves with a slotted spoon and rinse with cold water. Drain well. Place the leaves next to each other on a tea towel so that the edges overlap.
Add the ground pork fat and spread evenly. Roll up lengthwise with the help of a tea towel. Tie together with kitchen string. Fry the roulade in hot oil on all sides. Peel and chop the onion.
Add to the roll. Pour in the stock and cook in a closed pot for 40-45 minutes. Remove the roulade. Pour stock through a sieve and bring to the boil. Stir in the sauce thickener, bring to the boil once. Stir in sour cream and let it boil no more.
Season the sauce with paprika, salt and pepper. Arrange the roast with the sauce on a plate. Garnish with tomato wedges.