Peel and wash the potatoes and cook in salted water for about 20 minutes. Cut ham in half. Dab schnitzel dry and tap a little flatter. Season with salt and pepper and brush with mustard. Place 1⁄2 slices of ham on each, roll up and pin.
Wash the chives and cut into small rolls.
Heat the oil. Fry the rolls in it thoroughly all around. 1⁄8 Add l water and stock, bring to the boil. Cover and stew for about 10 minutes.
Drain the potatoes. Add fat and milk and mash everything finely. Stir in chives. Season the puree with salt and nutmeg. Arrange rolls and mashed potatoes.