Wash, clean and slice the tomatoes. Wash, clean and drain the lettuce and pluck into pieces. Drain the cucumbers. Wash meat, dab dry. Season with salt and pepper. Heat oil in a coated pan.
Fry escalopes for 2-3 minutes on each side. Cut the rolls in half crosswise, spread the lower half with mustard, the upper half with ketchup. Spread lettuce, cucumber, schnitzel and tomatoes on the lower half of the roll. Sprinkle with fried onions. Put the top of the buns on top. Serve garnished with parsley