The Starter Jar's Ultimate Multigrain Sourdough Loaf: A Data-Driven Guide to Hearty Perfection

Step 1

Step 1: Autolyse and Seed Hydration

Step 2

In a large bowl, combine the bread flour, whole wheat flour, rye flour, and 330g of the filtered water. Mix until no dry spots remain, then cover and let it rest for 30 minutes to 1 hour to autolyse. In a separate small bowl, combine the flax, sunflower, and pumpkin seeds with the remaining 20g of water. Let them hydrate alongside the autolyse.

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Step 2: Incorporate Starter and Salt

Step 4

Add the active sourdough starter and salt to the autolysed dough. Gently mix by hand, squeezing and folding until the starter and salt are fully integrated.

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Step 3: Bulk Fermentation and Folds

Step 6

Cover the bowl and let the dough rest for 30 minutes. Perform your first set of stretch and folds by gently pulling a section of the dough up and folding it over itself, rotating the bowl after each fold, completing 4-6 folds. Repeat the stretch and fold process every 30-45 minutes for a total of 4 sets, incorporating the hydrated seeds during the second set of folds. The total bulk fermentation time will be 3-5 hours, depending on your ambient temperature; the dough should increase in volume by 30-50% and show signs of activity.

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Step 4: Pre-shape and Bench Rest

Step 8

Gently turn the dough out onto a lightly floured surface. Carefully pre-shape it into a round or oval, ensuring not to degas it too much. Cover the dough with a bowl or plastic wrap and let it rest for 20-30 minutes for a bench rest, allowing the gluten to relax.

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Step 5: Final Shaping

Step 10

Lightly flour your hands and the work surface again. Gently shape the dough into its final boule or batard form, aiming to create surface tension. Carefully transfer the shaped dough, seam-side up, into a floured banneton or a bowl lined with a floured tea towel.

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Step 6: Cold Proof

Step 12

Cover the banneton with plastic wrap or a plastic bag and refrigerate for 8-12 hours, or up to 24 hours. This cold proofing significantly develops flavor and makes the dough easier to handle.

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Step 7: Preheat Oven and Bake

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Preheat your oven to 500°F (260°C) with a Dutch oven inside for at least 45-60 minutes. Carefully remove the hot Dutch oven and gently invert the cold dough into it, scoring the top with a sharp blade. Bake, covered, for 20 minutes at 500°F (260°C), then reduce the temperature to 450°F (230°C) and bake covered for another 15 minutes. Remove the lid and continue baking for 10-15 minutes, or until the crust is deeply golden brown.

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Step 8: Cool Completely

Step 16

Carefully remove the loaf from the Dutch oven and transfer it to a wire rack. Allow it to cool completely for at least 2-3 hours before slicing to ensure the crumb sets properly and flavors fully develop.