Mix wheat and rye flour, yeast and salt. Add 300 ml of water and work everything into a smooth dough. Cover and let rise in a warm place until the dough has doubled in volume (approx. 40 minutes).
In the meantime, if necessary, dice the bacon and leave it out a little crispy in a pan without fat. Place on kitchen paper and drain.
Knead the dough on a floured work surface, kneading in the fried onions and bacon (the best way to do this is to add onions and bacon in portions).
Shape the dough into 8 rolls and place on a baking sheet lined with baking paper. Score crosswise with a knife and cover again for approx. 20 minutes.
Bake in the preheated oven (electric stove: 200 ° C / gas stove: level 3) for about 20-30 minutes. Allow to cool on a grill.
The rolls taste heavenly warm and cold with good butter spread.