Add the dry ingredients for the loaf into a large, non-reactive (glass or plastic) mixing bowl and whisk to combine. Add the wet ingredients and whisk again to combine. The dough should begin feeling completely liquid, then thicken slightly to a medium thinness yoghurt consistency. I recommend adding water conservatively and incrementally to reach this consistency. An overly wet dough will be harder to rectify than a gradually hydrated dough.
Whisk until smooth, then cover the bowl and place in a draught free place for 1 hour.
While your dough is proofing, lightly grease and line your 10 x 10 x 23 cm steel bread tin USA pan pullman loaf tin.
Combine your seeds in a small bowl. I dedicate 3/4 of the seeds to be mixed into the loaf and the rest for the outside of the loaf.
When the dough is proofed, mix 3/4 or so of the seeds into the dough.
Wet the bottom of the loaf pan with a light splash of water, then sprinkle half of the remaining seeds into the base.
Decant the dough into the tin and use a wet hand to smooth down and moisten the top of the loaf. Sprinkle the remaining seeds onto the loaf evenly, then use a hand to gently press and adhere them to the loaf.
Cover with a plastic bag that will not touch the loaf (I use a plastic produce bag inverted over the tin) and proof for anywhere from 30 minutes to 1 hour. Important: temperature, season and hydration have huge impacts on how quickly a loaf proofs. If yours proofs in 20 minutes, that's fine - bake it. See the notes in 'my loaf is overproofed?' if you are struggling with over proofing.
Preheat your oven to 200C/400F.
When the loaf top is domed and reaching over the top of the loaf tin, it’s time to bake. Place the loaf in the oven for 20 minutes.
After this time, turn the heat down to 180C/356F and cook for an additional 30-40 minutes. The loaf top should be golden brown and sound hollow if you knock on it.
Remove the loaf from the oven and allow to cool in the tin for 15-20 minutes before gently using placing onto a cooling rack.
The higher hydration iterations of this loaf stay fresh on the bench for a couple of days. After that they are best as toast.