Soak the kernels, cracked wheat, and sourdough in water overnight
Mix in the salt and 2 types of flour, making sure there are no dry lumps of flour when you're done
Let it ferment for a few hours
Move to a baking tray with a lid
Bake at bottom rack at 180C (hot air setting) for 60 mins, no need to preheat!
Take the lid off after 45 mins and bake without for the remaining 15