For the stuffed oven onions, cut off the top third of the peeled onions as a lid. Boil water and add salt.
Blanch the onions in the boiling water for 5 minutes. Remove with a ladle and rinse with cold water for at least 2 minutes.
Then drain well in a colander. Carefully hollow out the onions until the edge is about half an inch thick.
Mix half of the hollowed out mixture with minced meat. Heat oil in a saucepan and fry the mixture in it.
Remove from heat and set aside. Soak the bread in a little water, squeeze it out and add it to the onion-meat mixture together with the finely chopped parsley and mix well.
Mix in the yolks and season with salt and pepper. Preheat the oven to 200 °C. Fill the hollowed out onions with the mixture and place in a greased baking dish.
Sprinkle with breadcrumbs and place a dab of butter on each of the oven onions. Bake for 45 minutes.