Pour the boiling water over the 5-grain flakes and allow to swell until the mixture is only lukewarm (approx. 30 minutes).
Add the remaining ingredients and knead very well, preferably with a food processor.
Cover and leave to rest in a bowl at room temperature for 1 hour.
Then shape into an elongated loaf and let it rest again in a well-floured proofing basket until the dough completely fills the mold and looks a little over the edge (approx. 30 min.).
During this time, preheat the oven with a fireproof bowl of water to 250 ° C with top / bottom heat.
Carefully turn the loaf out onto a baking sheet lined with baking paper and bake on the 2nd rail from the bottom for 20 minutes. Then turn the temperature back to 180 ° C and bake for another 40 minutes.
The bread is ready when it sounds hollow when you tap the underside.