How to Shape a Sourdough Boule
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Shaping is the step that turns a shapeless mass of fermented dough into a taut, round boule that holds its form and rises up rather than out. Good shaping creates surface tension, an even skin of gluten stretched tight around the outside of the dough that traps gas and encourages a tall loaf with an open interior. It looks intimidating in videos, but it comes down to a few simple movements you can learn in a single baking session.
Before final shaping, most bakers do a pre-shape. Turn your bulk-fermented dough gently onto a lightly floured counter, trying not to deflate it too much. Using a bench scraper and one hand, fold the edges toward the center and flip the dough so the seam faces down, then use the scraper to drag it in small circles across the counter. The slight friction between the dough and the unfloured surface builds a gentle initial tension. Let the pre-shaped round rest uncovered for 20 to 30 minutes so the gluten relaxes and becomes easier to work.
For the final shape, lightly flour the top of the rested round and flip it so the smooth side faces down and the sticky side faces up. Gently stretch the dough into a rough rectangle or circle, then fold it like a letter: bring the bottom up to the center, the two sides into the middle, and finally roll the top down over everything. This layering creates internal structure. Flip the bundle over so the seam is on the bottom and you have a rough ball.
Now tighten the boule. With the seam down, cup your hands around the far side of the dough and drag it toward you across the counter, letting the bottom grip the surface so the top skin stretches tighter with each pull. Rotate a quarter turn and repeat, working your way around until the surface is smooth and taut and the dough resists slightly when you touch it. Avoid over-flouring the counter here, because a little grip is exactly what builds tension. If the dough tears, you have gone far enough.
Once shaped, transfer the boule seam-side up into a floured banneton or a bowl lined with a floured cloth. Placing it seam-side up means that when you flip it out before baking, the smooth side will be on top and the seam will be underneath, giving you a clean surface to score. Pinch any obvious seam gaps closed before the boule goes into its basket to prevent it from opening up during proofing.
After shaping comes the final proof, either at room temperature for a few hours or overnight in the fridge for more flavor and easier scoring. A well-shaped boule should hold a domed profile rather than spreading into a puddle. If your loaves keep flattening out, the culprit is usually under-developed shaping tension or over-fermented dough, so focus on building a tighter skin and shaping while the dough still has spring. With a bit of repetition, the whole sequence becomes quick and almost automatic.