Step 1: Activate the Starter: Ensure the gluten-free sourdough starter is active and bubbly. Feed the starter 4-12 hours before beginning the recipe. It should have at least doubled in size after feeding.
Step 2: Mix the Dough: In a large bowl, combine the warm water and active starter. Whisk until the starter is mostly dissolved. Add the brown rice flour, tapioca starch, sorghum flour, psyllium husk powder, and sea salt to the bowl.
Step 3: Combine Thoroughly: Using a sturdy spatula or your hands, mix the ingredients until a thick, sticky dough forms. The dough should be well-combined with no dry pockets of flour.
Step 4: First Proof (Bulk Fermentation): Cover the bowl with a damp cloth or plastic wrap. Let the dough rest at room temperature (around 70-75F) for 1.5-2 hours. Perform a stretch and fold every 30 minutes during the first hour. This helps to develop the dough's structure.
Step 5: Shape the Loaf: Gently transfer the dough to a lightly floured surface (use rice flour). Shape it into a round or oblong loaf. Be careful not to deflate the dough too much.
Step 6: Second Proof (Final Proof): Line a bowl or banneton basket with parchment paper and lightly dust it with rice flour. Place the shaped loaf into the prepared bowl, seam-side up. Cover with a damp cloth or plastic wrap and let it proof in the refrigerator for at least 2 hours, or up to overnight. This slow, cold proof enhances the flavor and texture.
Step 7: Preheat the Oven: Preheat the oven to 450F (232C) with a Dutch oven inside for at least 30 minutes. The Dutch oven is crucial for creating a steamy environment, which helps the bread rise and develop a crispy crust.
Step 8: Score the Loaf: Carefully remove the hot Dutch oven from the oven. Remove the loaf (with the parchment paper) from the bowl and gently place it into the Dutch oven. Score the top of the loaf with a sharp knife or lame. This allows the bread to expand during baking and prevents cracking. A simple cross or a single slash down the center works well.
Step 9: Bake: Cover the Dutch oven with its lid and bake for 30 minutes. Then, remove the lid and bake for an additional 20 minutes, or until the crust is deeply golden brown and the internal temperature reaches 205-210F (96-99C).
Step 10: Cool Completely: Carefully remove the baked loaf from the Dutch oven and transfer it to a wire rack. Allow the bread to cool completely before slicing (at least 1-2 hours). This is crucial for the crumb to set and prevent a gummy texture.
Optional Tips:
For a different flavor profile, substitute almond flour for some of the brown rice flour.
If the dough is too sticky to handle, lightly flour your hands with rice flour.
If a Dutch oven is unavailable, bake the bread on a baking sheet with a tray of hot water placed on the bottom rack of the oven to create steam.