Wash the potatoes, cook in boiling salted water for 20 minutes, rinse with cold water and peel. In the meantime clean, wash and halve the mushrooms. Peel and finely chop the onion. Heat two tablespoons of fat. Fry the onion and mushrooms for ten minutes.
Add remaining fat and heat. Dust with flour. Add stock and cream while stirring constantly, bring to the boil and simmer for a while. Add peas and heat them up. Season to taste with salt, pepper and lemon juice. Wash the cutlets, dab dry and tap flatter. Cover with a slice of ham and parsley leaves. Fold the meat over and pin it with wooden sticks. Season with salt and pepper.
Wash the cutlets, dab dry and tap flatter. Cover with a slice of ham and parsley leaves. Fold the meat over and pin it with wooden sticks. Season with salt and pepper. Fry in hot oil for one to two minutes on each side. Arrange everything on plates garnished with parsley