Mix the flour, yeast, sugar and salt. Add 1 tablespoon of oil, vinegar, quark and approx. 150 ml of lukewarm water. Knead into a smooth dough with the dough hook of the mixer. Then cover and let rise in a warm place for about 60 minutes.
In the meantime, peel and finely dice the onion. Roast vigorously in 1 tablespoon of hot oil. Take out and let cool down. Then knead the onions and chopped parsley into the dough. Shape the dough into a loaf on a little flour.
Place the bread on a baking sheet lined with baking paper or, as I did, put it in a springform pan and cut lightly. Cover and let rise for about 15 minutes. Preheat the oven to 225 ° C O / U heat.
Dust the bread lightly with flour again and bake in the preheated oven for about 40-45 minutes. Then leave to cool on a wire rack.