Mix the dough: In a large bowl, add the water, sourdough starter, and honey, and whisk together until combined. Pour in the bread flour, pumpkin puree, pumpkin spice, and salt, and mix until a dough forms and no dry patches remain. Cover the dough and let rest at room temperature for 30 minutes.
500 g ( 4 cups and 2 tablespoons) Bread flour, 200 g (¾ cup + 2 tablespoons) pumpkin puree, 100 g (⅓ cup) sourdough starter, 200 g (¾ cups + 1 tablespoon) water, 10 g (1¾ teaspoons) salt, 20 g (1 tabelspoon and 1 teaspoon) honey, 1 teaspoon pumpkin spice
Stretch and fold: After 30 minutes, perform your first set of stretch and folds. To perform one set of stretch and folds, begin by splashing some water on your hands so they are damp. Grab one side of the dough, stretch it up and fold it all the way over the other side of the dough. Rotate the bowl and repeat this process with the next side. Once you’ve completed this process with all 4 sides, cover the dough and let it rest. Repeat this process every 60 minutes during the course of the bulk fermentation in the next step, until you’ve completed a total of 4 rounds of stretch and folds.
First rise (bulk fermentation): Cover the bowl and let the dough rise at room temperature for roughly 6 - 8 hours. The dough is done rising once it has increased in size by roughly 50%, has air bubbles on top, and is jiggly when shaken. If you're using a glass or transparent plastic container, you will also see bubbles formed on the bottom of the dough. The fermentation time may vary depending on the temperature of your home and the strength of your sourdough starter.
Shape the dough: Once your dough has completed its first rise, it’s time to shape. Line your proofing basket and dust it lightly with flour. Lightly flour your work surface and gently turn the dough out onto it. To shape, start by folding the bottom third of the dough up toward the center. Then, fold the left side in toward the middle, followed by the right side, slightly overlapping the left. Next, fold the top edge down just past the center, and bring the bottom edge up and over the top. Flip the dough so the seam rests on the counter. With floured hands, gently round the dough into a tight ball by pulling it toward you against the surface of the table to create tension. Use a bench scraper to transfer it to the floured proofing basket, seam-side up. This is my preferred shaping method, but there are many ways to shape sourdough bread — here’s a great video from The Perfect Loaf demonstrating the technique. Proof (second rise): Cover the dough and refrigerate it overnight, or for up to 48 hours. I recommend letting it proof for at least 12 hours — this slow fermentation develops deeper flavor, improves the crumb, and boosts the bread’s nutritional value. The extended rest gives your sourdough starter time to work its magic, enhancing both the gut-friendly benefits of the bread, along with the flavor and texture!