Onions peel, in strips cut. Wash the meat, dab dry. Roll up meat and tie up with kitchen string. Heat 2 tablespoons of oil in a large frying pan. Fry the meat well, turning it over, season with salt and pepper and take it out.
Alternately fold the strawberry puree and cream into the beaten egg white, do not stir. Pour the strawberry puree into a bowl and decorate with a halved strawberry.
Add the meat and braise covered at low heat for about 1 1/2 hours, adding a little water in between if necessary. Peel and wash the potatoes. Wash the rosemary, shake dry, pluck needles from the twigs and chop coarsely.
Add the potatoes, depending on size, and onions to the meat 25-30 minutes before the end of the cooking time and simmer, add rosemary about 10 minutes. Season to taste with salt, pepper and sugar.