Sift flour into a large enough bowl, cut butter into small pieces. Add egg yolks, iodized salt and 50 milliliters of water and knead into a smooth dough.
Wrap in cling film and place in the refrigerator for one hour.
Grease a cake springform pan (26 cm ø) or four tartlet molds with butter.
Roll out dough on a floured surface and line the mold with it. Prick the dough a few times with a fork and pre-bake in the heated oven at 220 °C on the middle shelf for about 15 minutes.
In the meantime, rinse and clean the vegetables and cut them into small strips or cubes.
Peel and chop the onions. Cut ham into small cubes and sauté with vegetables and onions in butter until translucent.
For the glaze, mix the eggs with the whipped cream and the quark. Season heartily with iodized salt, pepper, grated nutmeg and chopped parsley.
Form vegetable mixture on the dough as well as the glaze over it.
Bake the quiche on the middle rack for ten minutes. Then reduce the heat to 180 degrees. Bake the quiche on the lowest rack for another 15 to 20 minutes.
Our tip: It is best to use fresh herbs for a particularly good aroma!