Cook the macaroni whole in salted water until tender, then rinse with cold water through a sieve, so it doesn't stick together.
Grease small molds generously with lard, and line the walls all around with the macaroni in a honeycomb pattern.
Mix the egg yolks smooth with the butter, add the half-ground, half-cubed leftover meat, season with pâté spice mix and salt, and finally fold in the whipped egg whites.
Fill the macaroni-lined molds with the mixture, leaving a finger's width of space at the top.
Steam the molds (in a water bath) in an oven at 180°C for about 25-30 minutes, until the filling sets.
Meanwhile make the mushroom sauce: make a thin roux from the butter, add the mushroom slices, add the broth, and cook for a few minutes.
Remove from the heat, stir in the egg yolks and the cream, and warm through gently (don't boil).
Turn the tartlets out of the molds, and serve drizzled with the mushroom sauce.
Based on: Malatinszky Fanny szakácskönyve (a classic Hungarian cookbook), modernised. Calories and protein are estimated.