1. Cook the potato(es) in some salted water until done and then let it/them cool down. Peel, add to a large bowl and mash with a fork. Set aside. Crumble the yeast and add to the lukewarm water – mix until dissolved. Add it together with the three types of spelt flour to the bowl and mix – knead for about 6 minutes, then add the salt and knead 3-4 minutes more. The dough will be soft but should come off the sides of the bowl easily. Cover and let rise for 1 hour at room temperature, then place in the fridge for 22-23 hours.

2. On the day of baking cut the bacon into small dices and fry in a pan until lightly browned. Let it drain on a piece of paper to remove some of the fat. Grate the cheeses and set aside.

3. Take the dough out of the fridge and let it warm up at room temperature for about 10 minutes. Place it on a floured surface and roll out a rectangle with a size of about 50x25cm – the dough will be sticky, so use a good amount of flour if needed. Add the fried bacon and cheese in the middle of the rectangle (see pictures) and fold the sides over that filling to seal them in. Press the edges together to make sure nothing gets out. Flip that log upside down so the seam is on the bottom and place it on a piece of baking parchment. Use the handle of a wooden spoon to divide that log into 6 equal-sized packages by pressing it into the dough in 5 spots. Sprinkle with some flour. Use a sharp knife to cut the packages diagonally on top until you see some of the fillings. Cover everything and let it rest in a warm place for about 30 minutes.

4. Preheat the oven (including a baking sheet) to 250°C (480°F). As soon as the dough has risen long enough pull the filled bread with the baking parchment onto the baking sheet. Sprinkle some water (2-3 tablespoons) on the bottom of the oven and close the oven door immediately so the developing steam cannot escape. Reduce the heat to 230°C (445°F) and bake for 28-30 minutes until the bread is nicely browned. Remove the »Handbrot« from the oven and let it cool down a bit on a wire rack.

5. For the dip mix the sour cream with chives, season with lemon juice, salt, and pepper to your liking. Serve with the still warm bread and enjoy.