Let the puff pastry rest for about 10 minutes at room temperature. Clean and wash the peppers. Peel onion. Dice both finely. Knead well with ground pork, minced meat, 2 tbsp. breadcrumbs, tomato paste, 1 egg, salt and pepper.
Unroll puff pastry together with baking paper. Sprinkle with 2 tablespoons of breadcrumbs. Spread the chopped mass on top, press down lightly. Grate cheese over it. Roll up from the short side and place on a baking tray with the baking paper. Whisk 1 egg. Brush the roll with it. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for about 40 minutes.
Peel and wash the potatoes and cut them in half lengthwise. Cook in salted water for about 20 minutes. Clean, wash, quarter and cut cabbage into strips. Heat 1 tablespoon butter in a pot. Steam the savoy cabbage in it until transparent. Season with salt, pepper and nutmeg. Add cream and 1⁄4 l water, bring to the boil, cover and stew for about 20 minutes. Drain the potatoes.
Take out the chopping roll, let it rest for a short time. Heat 2 tablespoons of butter in a frying pan. Fry the potatoes for about 5 minutes until golden brown. Season with salt and pepper. Season to taste. Arrange everything.
So that nothing swells when rolling up, spread the mixture so that about 1 cm remains free around the edge. Roll up tightly with the help of the baking paper.