Mix corn flour and salt in a bowl
Add in 450ml of boiling water and mix well, let rest for 30minutes
In a seperate small bowl add the remaning of the 50ml of boiling water and wait until it has cooled down to luke warm water, then add the active dry yeast and stir well to disolve, let rest for 10minutes to activate the yeast.
Once the 30minutes are up, add the yeast to the corn flour and mix well.
add in the rye flour and all purpose flour, and slowly start adding in the room temperature water until the dought starts coming togther. Depending on your flour you might not need the 500ml of water, once the dought starts pulling away from the sides of the bowl you know that it does not need more water. NOTE this will be a sticky dough.
Cover and let the dough rest for 45minutes in a warm place, away from drafts.
Pre-heat oven to 400F
Devided the dough. At this point I invite you to watch the video above which will go into details on how to shape and add inclusions.
Bake at 400F for 35-40minutes until it reaches an internal temperature of 200F. Let cool completely before cutting into it.