Whisk the dry ingredients for the loaf (except for the optional hemp seeds) in a large non-reactive (plastic or glass) mixing bowl. Weigh out the 100-200g extra water for the loaf in a glass and set aside.
Combine the ingredients for the blended mixture in your blender and process until combined.
Pour the blended mixture into the dry ingredients.
Use a whisk to combine until a smooth, thick batter forms. It should be very sticky and just a little too wet to hold its shape in the bowl. If it looks dry or holds its shape, add the extra water and stir to combine.
Cover the bowl and leave on the bench to proof for 1 hour.
Grease and line a 10cm X 10cm X 23cm steel loaf pan. After the 1 hour is up, stir in the (optional) hemp seeds, then decant the batter into the loaf pan and use a wet hand to flatten and smooth the top. Cover the loaf and proof for another 30-60 minutes or until it has reached the top of the loaf pan.
While you are waiting, preheat the oven to 220C/428F.
When the loaf is proofed, place it in the oven for 50 minutes or until golden brown and firm on top. Check on it at the halfway point and turn the oven down to 200C/400F if it’s looking too browned.
Allow the loaf to cool for 15-20 minutes in the tin before carefully removing to place on a cooling rack. Allow to cool before slicing.
This bread is best as toast and keeps well in the fridge for a number of days. You can also slice the bread and toast it straight from frozen.