Mix the dry ingredients well. Pour beet syrup over it. Mix in the mineral water on a low setting or stir in by hand. Do not stir too vigorously, otherwise the driving effect of the carbonic acid will be lost.
Put in a 30 cm long loaf pan. Bake in a non-preheated oven for 80 minutes at 160 - 170 ° C with hot air / convection. Put a bowl of water in the oven.
In a steam oven only bake for 75 minutes at 160 ° C hot air and steam. Steaming in the meantime shortens the baking time. To be on the safe side, pierce with a needle and check whether the dough still sticks when you pull it out. If necessary, bake for another 5 minutes.