Mix the butter, the salt and the flour into the hot water, stir until smooth, and cook into a thick paste (a choux-like base). Let it cool.
Pound the ground veal finely in a mortar (or food processor) with a whole egg and an egg yolk, then pass through a sieve and mix together with the cooled flour paste.
Braise the mushrooms, onion and parsley in butter, sprinkle with flour, add the milk, and cook until thick.
Stirring constantly, let it cool, then mix it into the pounded veal mixture, seasoning with salt and pepper.
Shape the mixture into cutlets, and coat them in breadcrumbs.
Fry in butter or lard until a nice golden brown on both sides.
Arrange the cutlets in a wreath shape on a platter, put hot, cooked green peas in the middle, and serve warm.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.