Line a large baking tray with baking paper.
Weigh the sorghum and rice flour in a medium sized mixing bowl and stir to combine. Measure 100g of that flour into another small bowl and set aside. This small bowl will form our scald which adds elasticity and proofing power to our dough.
Pour 150-165g of boiling water evenly over the flour in the smaller bowl to make the scald. Have a spoon at the ready and vigorously mix until a gelatinous paste forms. It shouldn’t take more than 5-10 seconds. Set aside to cool a little.
Add the tapioca flour, psyllium husk powder, yeast, salt, optional pumpkin spice and sugar to the larger, original bowl of flour and whisk to combine.
Pour the contents of both bowls into your kitchen mixer with the paddle attachment.
Process the dough on a low speed for 2 or so minutes until the scald has broken up completely in the dough.
Add 250g pumpkin puree along with the oil and water. Reserve the remaining 100g pumpkin puree to add if your dough needs it.
Your ideal dough texture is almost like a moist cookie dough consistency prior to chilling. If you pick up a piece of dough between your hands, you should just be able to roll it into a ball. The dough should easily retain its whole shape in the bowl and if you pick up a piece of it.
If your dough is slightly wetter than this, you can fix this up in the rolling stage with extra tapioca flour on the bench. If your dough is drier than this, add the remaining pumpkin puree. You can also add 20ml water at a time to reach this consistency if it is still too dry.
Process the dough until all the pumpkin puree has been incorporated and the dough is orange (and smooth!)
Cover the dough bowl and place into the fridge for 30 minutes to firm up and proof a little.
While you wait, thoroughly preheat the oven. I like to preheat mine at 220C/430F to ensure it is at the right temperature for good oven spring.