Wash the potatoes thoroughly, drain and cut into slices. Peel, wash and cut carrots into thick slices. Mix potatoes, carrots, oil, 1 teaspoon salt and a little pepper in a bowl. Put into a wide, ovenproof dish. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 30-35 minutes, stirring occasionally
Wash parsley, shake dry and chop. Mix crème fraîche, sour cream, parsley and both mustards, season with a little salt, pepper and sugar. Wash chops, dab dry, season with salt and pepper. Heat clarified butter in a large pan, fry the chops in it in 2 portions for 2-3 minutes.
Place the chops on the potato and carrot mixture and spread the mustard cream on top. Increase the oven temperature (electric cooker: 250 °C/ circulating air: 225 °C/ gas: see manufacturer) and gratinate for 10-15 minutes