San Francisco Sourdough Bread

Why This San Francisco Sourdough Bread Works

During mixing, the starter and warm water loosen up together so the wild yeast can spread through the dough. As the flour goes in, the water soaks into it and gluten starts to form. Once the salt and sugar are kneaded in, the dough becomes smooth and stretchy. That long knead lines up the gluten so the dough can trap gas later instead of tearing.

Over the 4–6 hour rise, the yeast in the starter slowly eats the sugar and some of the flour. Gas bubbles build inside the dough, and the gluten net holds them in place, so the dough puffs and feels lighter. The rest after shaping lets that tight gluten relax a bit, which keeps the loaf from ripping open in random spots.

In the hot Dutch oven, steam from the wet dough stays around the loaf at first. That steam keeps the surface soft so the bread can rise more before the crust sets. As baking goes on and the lid comes off, the outside dries, browns, and turns crisp, while the inside stays moist and chewy.

Mistakes To Avoid

Using starter that isn’t active enough is the fastest way to get a flat, tight loaf. When the starter is weak, the dough barely rises in those 4–6 hours, so it goes into the oven dense and heavy instead of airy.

Adding the salt and sugar too early, before most of the flour is mixed in, can slow the starter down right from the start. The dough then rises much more slowly, often never really doubling, and bakes up with a gummy, under-risen center.

Letting the dough sit at room temperature for only a short time, or cutting the rise because it “looks okay,” often means the gluten isn’t fully stretched. The loaf then springs very little in the oven and comes out squat with a chewy, tight crumb.

Skipping the preheat of the Dutch oven, or putting the dough into a lukewarm pot, keeps the crust from forming fast. Instead of getting that sharp, blistered sourdough crust, the bread spreads out, bakes wider, and the crust stays pale and soft.