Wash the potatoes and cook in plenty of boiling water for about 20 minutes. Beans wash, clean and cook in boiling salted water for 10-15 minutes. Peel and chop the onions. Wash the meat, dab dry.
Season with salt and pepper and cover each with a slice of ham and cheese and fold up. Whisk the eggs in a deep plate. Turn cordon bleu in flour, egg and breadcrumbs one after the other. Rinse potatoes under cold water, drain, peel and slice.
Drain the beans. Heat butter in a pot and fry 1 onion for about 6 minutes while turning it. After about 3 minutes add the beans. Season with salt and nutmeg. Heat 2 tablespoons of clarified butter in a pan and fry the potatoes for about 10 minutes, turning them over.
Season with salt and pepper. After 6 minutes add the remaining onion. Heat 2 tablespoons of clarified butter in a second pan and fry the cordon bleu for approx. 10 minutes, turning. Arrange the fried potatoes, beans and cordon bleu on plates.