Soup greens clean or peel, wash and cut into small cubes. Peel and dice the onion. Wash oregano, shake dry and chop finely, except for a few leaves for garnishing.
Heat the oil in a large frying pan. Fry the minced meat for 4-5 minutes while turning it over. Add vegetable cubes and paprika, fry for about 3 minutes. Stir in tomato paste and dust with flour. Add stock, wine and peeled tomatoes, season with salt, pepper and sugar.
Stir in the oregano. Simmer for about 45 minutes, stirring occasionally.
In the meantime peel, wash and quarter the potatoes. Cook in boiling salted water for about 20 minutes. Heat milk and butter in a pot. Season with salt and nutmeg. Drain the potatoes. Press them through a potato press into the hot milk and mix to a creamy puree.
Tempere a gosto com sal e noz-moscada.
Season Bolognese with salt and pepper. Pour into an ovenproof dish (23 cm Ø). Spread the mashed potatoes with the back of a spoon in a wavy pattern. Whisk the egg yolks with 2 tbsp. water.
Spread the casserole with it. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 20 minutes. Garnish with some paprika and the remaining oregano.