Rustic Sourdough Loaf

A rustic sourdough loaf is a chewy, tangy bread made with just flour, water, and sourdough starter, with no commercial yeast. The long fermentation builds flavor and creates the open crumb and crispy crust you want. Success comes down to reading the dough’s readiness, not the clock.

Ingredients for Rustic Sourdough Loaf

Sourdough starter ferments the dough and gives it tang, while bread flour develops a strong gluten network that traps air and creates an open crumb. Water hydrates the flour and activates fermentation. Salt strengthens gluten, slows fermentation, and seasons the bread.

Why This Rustic Sourdough Loaf Works

Sourdough starter is a living culture of wild yeast and bacteria that ferment slowly over many hours. This long fermentation does two things: it builds complex, tangy flavor as the bacteria work, and it breaks down the flour in a way that makes the crumb open and airy instead of dense.

The dough goes through bulk fermentation first, when it rises in one mass and develops structure. Then you shape it and let it proof, which is a second, slower rise that gives the loaf its final volume and an open interior. The oven’s heat stops fermentation and sets the crumb, while steam keeps the crust soft enough to expand before it hardens and browns.

Mistakes To Avoid

Overfermentation happens when bulk fermentation goes too long and the dough becomes too soft to shape. The loaf will spread instead of rise in the oven, and the crumb will be dense and gummy. Watch for the dough to increase by about 50 to 75 percent, not until it doubles.

Cold or weak starter produces slow fermentation and a pale, dense loaf. Make sure your starter is bubbly and active before mixing. If you keep it in the fridge, take it out and feed it at room temperature for a few hours until it doubles and smells sharp and yeasty.

Skipping the steam step gives you a thick, tough crust and a loaf that does not expand properly. Without humidity in the oven, the crust sets too early and the bread cannot rise fully. A Dutch oven traps the loaf’s own moisture. Uncover it for the last 15 to 20 minutes so the crust can brown.

Slicing while the bread is still warm causes the crumb to compress and tear instead of showing clean, open holes. Let the loaf cool to room temperature, about 2 to 3 hours, before you cut into it.

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Ingredients

• 500 grams (about 4 cups) bread flour
• 350 milliliters (about 1.5 cups) water, room temperature
• 100 grams (about 1/2 cup) active sourdough starter, bubbly and doubled
• 10 grams (about 2 teaspoons) salt

Step-by-step Instructions

1. Mix flour, water, and sourdough starter in a large bowl until no dry flour remains, about 2 minutes. Let it rest for 30 minutes.
2. Add salt and mix until fully incorporated, about 5 minutes of squeezing and folding the dough by hand until it comes together.
3. Perform a series of stretch-and-folds over the next 2 to 3 hours: every 30 minutes, wet your hand, grab one side of the dough, stretch it up and fold it over the center, rotate the bowl a quarter turn, and repeat 4 times. Stop when the dough feels smooth and holds its shape.
4. Let the dough bulk ferment at room temperature (68 to 72°F or 20 to 22°C) for 4 to 6 hours total. Poke it gently near the end. When the indent springs back slowly and leaves a slight mark, fermentation is done. The dough should increase by 50 to 75 percent, not double.
5. Turn the dough onto a lightly floured work surface, gently pre-shape it into a round, and let it rest for 20 to 30 minutes.
6. Shape the dough into a tight round, pulling the surface toward you and sealing the seam on the bottom. Place it seam-side up in a banneton or a bowl lined with a floured kitchen towel.
7. Cover and refrigerate overnight, or up to 18 hours. Cold proofing develops flavor and makes the dough easier to score.
8. Place a Dutch oven in the oven and preheat to 500°F (260°C) for 45 minutes.
9. Turn the dough onto parchment paper, score the top with a sharp knife or bread lame in a shallow cross, about 1/4 inch deep.
10. Carefully transfer the dough on parchment into the hot Dutch oven, cover with the lid, and bake at 500°F (260°C) for 20 minutes.
11. Remove the lid and lower the oven to 450°F (232°C). Bake for 25 to 30 minutes more, until the crust is deep golden brown and the loaf sounds hollow when tapped on the bottom. The internal temperature should reach 205 to 210°F (96 to 99°C).
12. Cool the loaf on a wire rack for at least 2 to 3 hours before slicing.