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Sourdough ciabatta cut open to reveal large holes to show an open crumb with a crisp, crackly crust.
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5 from 77 votes

Sourdough Ciabatta

This sourdough ciabatta is an Italian white bread with a thin, crispy crust and large, irregular holes, called an open crumb. It's a high hydration dough made with active starter, flour, water, and olive oil. The perfect Italian sandwich bread!
Prep Time3 hours
Cook Time15 minutes
Total Time3 hours 15 minutes
Course: Baked Goods
Cuisine: Italian
Servings: 8
Calories: 400kcal


Wet Ingredients

  • 75 g sourdough starter or levain 100% hydration; use when most active
  • 15 g olive oil
  • 5 g water
  • 3 g barley malt syrup
  • 652 g Poolish see Note 1

Poolish Ingredients

Dry Ingredients


Prepare the poolish

  • Make Poolish: About 12 hours prior to baking, add all the ingredients for the poolish in a large bowl or container and mix together well.
    Cover with plastic wrap and let sit out at room temperature. When ready, there should be large bubbles at the surface and there should be no sign of receding (deflating). Check the side of the container for any mark of recession. (See Note 1)


  • Mix: Add all the wet and dry ingredients (including the poolish) to a large mixing bowl attached to a stand mixer. Make sure the salt is not in contact with the active dry yeast.
    Using a dough hook, mix on low speed until the dry flour has been fully incorporated. Then increase to speed to high.
    The dough should form into a smooth ball with very little sticking to the sides of the bowl. Scrape the dough from the bowl and hook once or twice. After about 6 to 10 minutes, the surface should be smooth and have a slight sheen.
  • Windowpane Test: Stop your mixer and sprinkle a bit of flour on a small section of the dough. Stretch that section of dough between your fingers to check for gluten development. It should pass the 'windowpane' test, which means you're able to stretch the dough until it's thin and translucent enough to see your fingers through it.

Proof and Shape

  • Bulk Fermentation: Transfer the dough to a large see through container (See Note 2). Shape the dough into a round ball by tucking the sides in, ensuring the surface is smooth as that will be the exterior of the bread. Cover with plastic wrap.
    Transfer to a warm and humid proofing box for 30 minutes (see Note 3). Punch it down, then proof until it's doubled in size. You should see air bubbles forming all the way to the surface of the dough.
  • Bench Rest: Transfer the dough on a well floured surface. Be sure to preserve the smooth surface of the dough and keep it facing up. Gently stretch it by hand by pulling the corners and sides into a rectangular shape about 1 inch thick, taking care not to deflate the dough. Do not use a rolling pin as that will deflate the dough. Let it bench rest for 10 minutes.
  • Shape: Cut into 6 even pieces using a bench scraper. Flip them over and lay them surface side down on a well floured proofing cloth. Pinch the proofing cloth in between the dough to create a border and lightly cover with the cloth.
  • Final Fermentation: Let the dough proof at room temperature or until almost doubled in size.
  • Preheat: Preheat the oven to 356°F and place the rack in the center of the oven. Place a baking sheet with at least 1 inch high sides on the bottom shelf. This will be used to create that initial burst of steam required for oven spring.


  • Bake: Flip the dough over so it's surface side up and transfer them to heat proof baking mat. Place the baking mat directly on the middle rack of the oven. See Note 4. Carefully pour ⅓ cup of water onto the baking sheet to create steam and quickly shut the oven door. Wear oven mitts to avoid steam burns. See Note 5.
    Bake for 15 minutes at 356°F.


  1. Poolish: I usually make my poolish 12 hours before using it. This is based on my experience with the ambient temperature of my kitchen, which hovers around 74 degrees F. You may need to adjust your times based on how cool or warm it is. You can speed this up or slow it down by changing the surrounding temperature.
  2. Transfer the dough: To make the transfer easier, sprinkle a bit of flour around the sides of the bowl and use a flexible bowl scraper to transfer the dough. 
  3. Proofing box: If you don't have a proofer, you can leave the dough covered in a warm, humid place out of direct sunlight. Some suggestions: 
    1. Use an oven: Place the dough on the top rack of your oven and place an empty pan on the bottom rack. Pour boiling water halfway up the pan on the bottom rack and keep the oven door closed. This will create enough heat and humidity to proof the dough. You can also leave the oven light on if you need more heat.
    2. Use an insulated cooler or icebox: Add about 1 or 2 inches of hot water to an insulated cooler and place the dough inside on top of a container to keep it away from direct contact with the hot water. This will create a warm, moist environment similar to a proofer. This is my preferred way to proof bread at home. 
  4. Transfer to oven rack: Use a large, flat baking sheet to transfer the baking sheet directly onto the oven rack. Use a quick, swift motion to push the baking mat onto the oven rack and quickly pull the baking sheet away. The baking mat I recommend allows for air flow which helps create a crispy crust. This is why I bake it directly on the oven rack. 
  5. Adding Steam: Avoid letting the water touch any glass or stoneware as it can shatter those materials. Use an oven mitt when pouring the water as it can cause steam burns.
    1. Why add steam when baking? The steam helps develop oven spring, which refers to that initial burst in volume during the first 10 minutes of baking. It prevents a hard crust from forming prematurely which allows the bread to continue expanding to form an open crumb full of large holes with a crispy thin, crackly crust.


Calories: 400kcal | Carbohydrates: 78g | Protein: 12g | Fat: 3g | Saturated Fat: 1g | Sodium: 392mg | Potassium: 109mg | Fiber: 3g | Sugar: 1g | Vitamin A: 1IU | Vitamin C: 1mg | Calcium: 17mg | Iron: 2mg