1- Disslove yeast and sugar in milk.
2- Sift flour in a large mixing bowl. Make a well in center. Place yeast, butter, 2 eggs and salt in well. Knead into a soft dough. Cover and set aside for it to rise.
3- Divide dough into equal pieces (approximately the size of a lemon).
4- Prepare filling: Brown mince with chopped onion and a little butter. Cover and continue to cook until juices evaporate. Add salt, pepper and chopped parsley.
5- Roll each piece of dough out,on floured surface, into a fine sheet of pastry.
6- Spoon some of the meat mixture down the center of each sheet of pastry. Fold the edges of the pastry inwards. The filling should be visible.
7- Brush with egg yolk and bake in a moderate oven until golden brown.
8- Brush tops with melted butter and serve immediately.