75% Hydration Sourdough Bread Recipe: Foil-Sealed Crust With Open Crumb Magic

Mastering a 75% hydration sourdough bread recipe transforms your kitchen into a bakery—where each loaf boasts a foil-sealed crust and an open, airy crumb that defies expectations.

The secret lies in precise hydration (75g water per 100g flour) and controlled fermentation, which develop flavor and structure while avoiding common pitfalls like dense crumb or weak oven spring. This recipe delivers professional results with simple techniques, perfect for home bakers ready to elevate their skills.

The process begins with a high-hydration dough that requires patience but rewards with dramatic texture and flavor. Bulk fermentation lasts 12–18 hours at room temperature, with strategic folds to strengthen gluten and distribute yeast evenly.

Shaping and final proofing (2–4 hours) ensure an open crumb, while baking with steam and foil creates that signature crispy crust. Every step is designed to build confidence, even for beginners.

What you’ll achieve is a loaf with golden, crackling crust and a light, elastic crumb that’s impossible to resist. The foil-sealed technique locks in moisture while creating a dramatic crust, and the open crumb structure makes every slice feel luxurious.

This method transforms sourdough from intimidating to achievable, with results that rival artisanal bakeries.

Whether you’re baking for family, friends, or yourself, this recipe scales effortlessly and stores beautifully for days. The key to success? Attention to detail during fermentation and baking—trust the process, and you’ll never buy store-bought bread again. Let’s get started on your first perfect loaf.

Ingredients for 75 hydration sourdough bread

Precision ingredients transform ordinary flour into artisanal sourdough with professional crust and crumb.

The bread flour is non-negotiable here—King Arthur or Caputo deliver the high-protein structure needed for that signature open crumb. Diamond Crystal kosher salt is essential for accurate measurement (it's coarser than table salt), and your sourdough starter should be at its peak activity, with bubbles forming on the surface within an hour. For water, filtered is ideal to avoid mineral interference, though tap water works in most cases. Almond flour isn't just for flavor—its fine texture prevents the dough from sticking during shaping, while the olive oil ensures a supple, easy-to-handle dough. Baking stones from Lodge or Amazon Basics are budget-friendly but effective; preheat them aggressively to mimic commercial ovens.

No almond flour? Rice flour works in a pinch, though the dough may stick slightly more. Salt substitutes like Morton's Lite Salt require precise measurement—use half the weight since it's finer. Sourdough starter too weak? Boost with 1 tsp active dry yeast for the first bulk fermentation, though purists may prefer to revive their starter first. Olive oil can be swapped for avocado oil (neutral flavor), but avoid vegetable oils with low smoke points. For steam, ice cubes are foolproof, but a steam pan or spray bottle also works. Baking stones too expensive? A Dutch oven creates similar steam conditions—just place it directly on the oven rack.

Store unbaked dough in an airtight container with a damp towel for up to 24 hours in the fridge, though it develops best at room temperature. Baked loaves stay fresh for 3-4 days at room temperature, wrapped in a cotton towel to prevent staling. For longer storage, slice and freeze—reheat individual portions in a toaster or oven for crispy results. Baking stones retain heat well, but replace them every 2-3 years for optimal performance. Sourdough starter can be refreshed indefinitely; maintain it with equal parts flour and water daily for consistency.

Step-by-step instructions for 75% hydration sourdough bread

Master the art of high-hydration dough with this precise method designed for perfect crust and open crumb structure.

In a large mixing bowl, combine the 1000 g bread flour and 750 ml water at room temperature. Using a dough whisk or your hands, mix just until no dry flour remains—this creates your autolyse. The dough will appear shaggy and sticky, which is exactly what we want at this stage.

Cover the bowl tightly with plastic wrap and let rest for 30 minutes. During this time, the flour absorbs water and gluten begins to form. You'll notice the dough becomes smoother and more cohesive. This autolyse step is crucial for our high-hydration dough—it prevents overworking later and develops the gluten structure needed for that signature open crumb.

After the autolyse, add the 250 g active sourdough starter and 10 g kosher salt to the bowl. Using a dough scraper, gently fold these ingredients into the dough until fully incorporated. The dough will become more elastic and slightly firmer as the salt strengthens the gluten.

Next, add the 50 g almond flour and fold it in as well. The almond flour serves two purposes: it adds nutritional value while also improving the dough's handling properties during shaping. Wet your hands with water and continue folding for 5-7 minutes until the dough is smooth and elastic. You're looking for a dough that springs back slowly when poked—this indicates proper gluten development without overworking.

Transfer the dough to a lightly oiled bowl, cover with a damp towel, and let ferment at room temperature (70-72°F) for 4-5 hours. During this time, the dough will roughly double in size. I recommend doing this in a slightly warm environment—if your kitchen is cooler, extend fermentation up to 6 hours until the dough passes the "poke test."

To perform the poke test, gently press your finger into the dough. If it springs back slowly (like Jell-O) and leaves a clear indentation, it's ready. If it springs back quickly, it needs more time. The bulk fermentation develops flavor and creates gas bubbles that will become our open crumb structure. I like to do two sets of stretch-and-folds at 1-hour and 3-hour marks to strengthen the gluten without overproofing.

Turn the dough onto a lightly floured surface and gently shape it into a round boule. I use the "stretch and fold" method during shaping to maintain tension in the dough. Once shaped, place the dough seam-side up on a piece of parchment paper. Cover loosely and let it proof at room temperature for 30 minutes to relax slightly before cold proofing.

For cold proofing, place the dough in the refrigerator for 12-16 hours. This slow fermentation develops complex flavors. Before baking, preheat your baking stone in the oven at 475°F for 1 hour. When ready to bake, place the dough on the preheated stone and score the top with a razor blade. Immediately place 1 cup ice cubes in a metal bowl on the lower oven rack to create steam. Cover the stone with aluminum foil for 15 minutes to trap steam and create that perfect foil-sealed crust.

After 15 minutes, remove the aluminum foil and bake for an additional 20-25 minutes until the bread reaches an internal temperature of 205-210°F. The crust should be deep golden brown with a crisp exterior. I like to rotate the baking stone halfway through for even browning.

Remove the bread from the oven and immediately brush the top with 1 tbsp olive oil while still hot. Let it cool on a wire rack for at least 1 hour before slicing. Before serving, lightly dust the cooled loaf with 2 tbsp rice flour to prevent sticking. The result should be a crust with beautiful oven spring and an open, airy crumb structure that's perfect for sandwiches or toast.

Troubleshooting perfect results

Dense Crumb Fix

If your sourdough turns out dense instead of open, your bulk fermentation likely didn’t develop enough gluten or gas. First, ensure your sourdough starter is active—it should float in water within 4-5 hours.

For future batches, extend bulk fermentation to 16-18 hours at 70-72°F and perform 3 sets of stretch-and-folds (every 4 hours). Overmixing can also weaken structure, so handle the dough gently during shaping. 🌟

Weak Oven Spring

Poor oven spring (when the bread doesn’t rise dramatically in the oven) usually means the dough wasn’t tense enough before baking. Shape your dough tightly into a boule or batard, and avoid overproofing—your dough should double in size during bulk fermentation but not collapse.

Preheat your baking stone for at least 1 hour at 475°F, and use ice cubes for instant steam. If your oven lacks steam, place a metal bowl of boiling water on the lower rack instead. ⚡

Sticky Dough Nightmare

High-hydration dough (like 75%) can feel impossible to handle, but almond flour and olive oil are your allies. Dust your work surface with rice flour (not all-purpose) and wet your hands frequently to prevent sticking.

If the dough tears during shaping, let it rest 10-15 minutes before trying again. For extra grip, use a dough scraper to lift and fold—never pull or stretch the dough. 💪

Pale or Underbaked Crust

A pale crust often means insufficient steam or heat. Double-check your steam injection—place 1 cup ice cubes in a metal bowl on the oven rack immediately when loading the dough. If your oven runs hot, reduce temperature to 450°F for the first 20 minutes to prevent burning.

For a deeper color, brush the crust with extra-virgin olive oil after removing the foil. Bake until internal temp hits 205-210°F—a toothpick should come out clean. 🔥

Dough Collapses During Proof

Collapsed dough usually means overproofing or weak gluten. For bulk fermentation, stop when the dough springs back slowly (like Jell-O) when poked. If it springs back too quickly, it needs more time. For final proof, don’t exceed 2-3 hours at room temperature—longer proofs risk collapse.

Cold proofing (12-16 hours in the fridge) is more forgiving. If your dough still collapses, strengthen gluten with 1 extra set of stretch-and-folds during bulk fermentation. ✨

Frequently asked questions