Preheat oven to 230C/450F.
In a large bowl mix the flours and sprinkle over the dried yeast and the salt.
Mix the treacle with the hand hot water and pour over the flours and mix.
Allow to sit for 5-10 minutes while you prep and liberally brush the base and sides of a loaf tin with sunflower oil.
Pour the wet batter into the bread tin, cover with a tea towel and place in a warm, draft free area.
Let it sit for about 15-20 minutes or until it has risen to the top of the pan.
If you are using sesame seeds, sprinkle them on top now.
Bake for 20 minutes.
Turn down the oven to 200C/400F for another 40-50 minutes until it sounds hollow when tapped.
