Mix the baking mix and yeast. Add 720 ml lukewarm water. Knead briefly with the dough hooks of the hand mixer at low setting, then at highest setting for approx. 3 minutes. Cover and leave to rise in a warm place for approx. 30 minutes
Peel 4 onions, dice finely. Fry them crisply with the ham in hot oil and let them cool down
Knead the dough with floured hands. Form into 2 rolls (approx. 50 cm long). Press slightly flat. Spread the ham filling over it, fold the dough over it and form it into rolls again. Turn over and lay diagonally on a baking tray lined with baking paper. Bake in a hot oven (electric cooker: 200 °C/ convection oven: 175 °C/gas: level 3) for 45-50 minutes
Peel 1 onion, dice finely. Wash and chop the chives. Mix with quark, cream cheese and mineral water, season to taste. Take out the bread and let it cool down. Add the quark. Cover with tomatoes and chives