Mix yeast and honey in a bowl with little water
Add the 3 flours and remaining of the water and mix well
Add the salt and the psyllium and mix well
Pre-heat the oven at 50°C and turn it off once temperature reached
Cover the bowl and let it rest in the oven for 6hrs
Take out the bowl, sprinkle some flour on the dough
Make a ball and carve a cross with a knife on the dough
Re-heat the oven at 50°C and turn off when temperature is reached
Place the ball on an oven tray, cover it and put it back in the oven for 2hrs
Take out the bread and pre-heat the oven at 220° C (upper and lower heat)
Cook the bread for 55min
Remove the bread and let it rest