Soak the bun. Finely chop parsley and onion and fry, squeeze out the roll.
Put the rolls, parsley, onion, minced meat, 1 egg, salt, pepper and paprika in a bowl. Add the sauerkraut, ham and cheese and mix everything well.
Roll out the defrosted puff pastry into a thin sheet of approx. 35 cm x 30 cm. Spread the meat dough evenly on top, leaving an approx. 1 cm wide edge. Roll up the plate lengthways. Whisk the second egg and brush the puff pastry roll with it.