Add the raisins to a small bowl and pick off any stems you find. Then cover with warm water. Put a lid on the bowl and set aside for 1 - 3 hours.
85 g raisins
Line an 8" loaf pan with parchment paper and set aside.
To a medium mixing bowl, add the tapioca, millet, oat, sorghum, salt, and cinnamon. Whisk to combine.
160 g tapioca flour, 120 g millet flour, 60 g gluten-free oat flour, 60 g sorghum flour, 11 g salt, 5 g ground cinnamon
Add the sugar to a small pot. Then add the milk, water, and butter. Place the pot on the stovetop and heat over medium until the butter is melted, stirring frequently.
50 g maple sugar, 165 g cashew milk, 165 g water, 28 g butter
Turn the heat off and add the psyllium husks to the pot and stir immediately to fully combine. Set aside to let gel for a few minutes.
20 g whole psyllium husks
While you wait for the psyllium to gel, strain the raisins and set them aside.
Add the starter to the bowl of a stand mixer. Then add the psyllium gel and whisk to combine with a dough whisk.
300 g gluten-free sourdough starter
Add the flours and raisins to the wet ingredients. Then hook the bowl onto the stand mixer with the paddle attachment. Turn the mixer on the lowest setting and gradually increase to one setting higher to mix the dough. It is ready when there is no dry flour left in the bowl.
If you are using a proofing box, add a 1/4 of water to the tray and set the temperature to 80℉. Take the dough out of the bowl and shape it into a loaf. Then place it into the lined loaf pan. Cover with plastic wrap or place into proofing box uncovered if you have one.
Let rise for 2 1/2 hours at 80℉. If the temperature is cooler, it will take more time (3-5 hours). When the dough has risen to the top of the loaf pan, it is ready to bake.
30 minutes before you are ready to bake, preheat your oven to 450℉. Cover the bread with a 9 x 5 inch loaf pan and place in the oven. Turn the temperature down to 425℉ and bake for 20 minutes.
Uncover the bread and turn the oven temp down to 375℉. Bake for 30 minutes. Then turn the temperature down to 350℉ and bake for 40 minutes. Turn the oven off and let the bread sit for 10 minutes before removing it.
Lift the bread out of the pan using the parchment paper, and place on a wire rack to cool completely.