For the pre-dough, knead all the ingredients and cover with cling film and let rise overnight for approx. 12 to 14 hours.
Toast the sesame seeds in a pan without oil. Halve the avocado and remove the pulp, mash it with a fork or a hand blender to a puree, then mix this with the batter and the water. Add the whole wheat flour, salt and yeast and knead well, then let the dough rest for 15 minutes, do not cover.
Then add the rest of the wheat flour and the sesame seeds and knead everything into a smooth dough. Cover the dough and let it rise for about 2 hours until it has doubled in volume, folding the dough once after 1 hour.
Halve the dough and shape into 2 oblong loaves, place them on a baking tray and let rise, covered, for 1 hour.
Preheat the oven to 220 degrees in good time and cut and shoot the loaves as desired, steaming well and baking for about 30 to 35 minutes.