Melt the butter, add the flour and enough broth or water to make a thick mixture, then let it cool.
Pound the cooled base in a mortar or food processor together with the ground veal, the egg, salt and pepper until fine.
Carefully fold in the whipped cream.
For the mushroom hash, braise the mushrooms, onion and parsley in butter, sprinkle with flour, and add enough broth and tomato purée to make a thick paste; season with salt and pepper.
Dipping your finger in egg white, smooth the meat mixture into cutlet shapes, leaving a hollow in the middle.
Put some mushroom hash into the hollow, and smooth more of the meat mixture over the top, evening it out with a wet knife.
Stand the molds in a dish of water reaching up to their height, and steam them over the stove for about 20-25 minutes, until set.
Turn out onto a sieve to cool, roll in egg and breadcrumbs, fry in hot lard until golden brown, and serve hot.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.