Peel and chop the onions. Heat 3 tablespoons of oil in a pot and fry the onions until transparent. Season with salt, pepper, sugar and paprika. Deglaze with tomatoes, stock and cream, bring to the boil and simmer for 8-10 minutes.
Pour the pineapple into a sieve, drain.
Wash the meat and dab dry. Heat 5 tablespoons of oil in a frying pan, fry the meat in portions while turning, season with salt and pepper. Remove the escalopes from the pan and place them next to each other on a baking tray.
Cover each cutlet with a slice of ham and a slice of pineapple. Spread the sauce evenly on top. Cover with foil and press firmly around the tray. In a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) bake for about 2 1/4 hours.
Carefully remove the foil about 45 minutes before the end of the baking time. Spread the cheese on the baking tray and finish baking. Remove from the oven and garnish with marjoram if desired.