Peel the potatoes, cut into cubes, fry in a pan with a little olive oil, season with salt and pepper.
Then cut the salami, cheese, pickles and hard-boiled eggs into small cubes and mix well in a suitable container. Add the sour cream and yoghurt and season with a little pepper. The salami is salty enough, so don`t use salt.
Add the fried potatoes and stir everything together again. Pour the mixture onto the puff pastry, form a strudel and brush with the beaten egg. Bake in a preheated oven at 180 ° C for about 25 minutes.