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

A 75-percent hydration sourdough bread recipe transforms your kitchen into a bakery with its open crumb and crispy crust—no fancy equipment required. I perfected this method after years of experimenting with hydration levels, and the foil-sealed crust technique ensures a golden, shatteringly crisp exterior every time.

The higher hydration creates an airy, open crumb structure that’s light yet sturdy, perfect for sandwiches or toast.

This recipe balances traditional sourdough techniques with modern adaptations like autolyse and cold proofing to simplify the process without sacrificing flavor. The dough is more manageable than wetter sourdoughs but still develops that signature tang and depth.

I’ve included troubleshooting tips for handling stickiness and fermentation control, so even beginners can achieve professional results.

By the end, you’ll have a loaf with a foil-sealed crust that cracks open beautifully, revealing an open crumb that’s impossible to resist. The crust is crispy and caramelized, while the interior stays tender and flavorful. This bread keeps well for days, making it ideal for meal prep or gifting.

Whether you’re a seasoned baker or new to sourdough, this recipe delivers restaurant-quality results with minimal fuss. Let’s get started on creating your perfect loaf.

Ingredients for 75 hydration sourdough bread

Just ten ingredients transform your kitchen into a bakery—crisp crust, open crumb magic included.

The sourdough starter is non-negotiable here. King Arthur's starter or a well-fed home culture works best—look for bubbles and a tangy aroma. I keep mine in a glass jar on my counter, feeding it daily with equal parts flour and water. The high-gluten flour (like King Arthur) gives that signature open crumb, but Bread flour works too if that's what you've got. For the water, room temperature is key—cold slows fermentation, and hot can kill your starter. Filtered water has fewer impurities, but tap works fine if you're consistent. The olive oil adds richness to the dough, but avocado oil works just as well if you prefer a neutral flavor.

No almond flour? Skip it entirely—the bread will still be delicious. The almond milk is optional but helps create that extra-tender crumb. If you're feeling fancy, whole milk works too, but the neutral flavor of almond milk keeps things from getting too heavy. The foil is your secret weapon for that crispy crust—heavy-duty foil holds up better than regular. For the cornmeal, polenta works in a pinch, but it won't give the same toasty flavor. The baking stone is ideal, but a cast-iron skillet or inverted baking sheet does the job too. Just make sure it's preheated for at least 30 minutes before you load it up with dough.

This dough is sticky—embrace it. Wet hands and a dusting of flour are your best friends. The cold proof in the fridge is where the magic happens—8-12 hours lets the flavors develop fully. Once baked, let the loaf cool completely on a wire rack before slicing—this prevents a gummy crumb. The bread keeps well for 4-5 days wrapped in a clean kitchen towel, or you can freeze slices for up to 3 months. For that perfect crust, brush the cooled loaf with melted butter—game-changer. And if anyone asks, yes, it's worth the wait.

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

Here's how to craft a sourdough loaf with a crisp foil-sealed crust and airy open crumb—no shortcuts, just science-backed technique.

In a large mixing bowl, combine the 3.5 cups all-purpose flour and 2.5 cups water at room temperature. Use your hands or a dough whisk to break up any dry spots until you have a shaggy, sticky mass. This initial mix, called an autolyse, allows the flour to fully hydrate and gluten to begin developing before we add salt or starter.

Cover the bowl with a damp kitchen towel and let rest for 30 minutes. You'll notice the dough transform from rough and crumbly to smoother and more cohesive. This step ensures a lighter, more open crumb structure in your final loaf. I always set a timer because it's easy to forget this crucial waiting period.

After the autolyse, add the 0.5 cup active sourdough starter to the bowl. Using a dough whisk or your hands, gently incorporate it into the dough until fully combined. Then add the 0.75 tsp kosher salt and 1 tbsp olive oil. The almond flour and almond milk are optional but add richness—if using, sprinkle in the 0.25 cup almond flour and pour in the 0.25 cup almond milk now.

Mix until the dough comes together into a smooth, elastic mass. It should be slightly tacky but not wet. If it feels too sticky, you can add 1 tablespoon of flour at a time until it reaches the right consistency. Let the dough rest, covered, for another 30 minutes. This second rest helps the gluten relax and strengthens the dough structure.

Wet your hands with water to prevent sticking, then grab one side of the dough and stretch it upward while folding it over itself. Rotate the bowl 90 degrees and repeat this stretch-and-fold motion three more times, completing one full set. This technique builds gluten strength without overworking the dough.

Perform three sets of stretch-and-folds, resting the dough for 30 minutes between each set. You'll notice the dough become smoother and more elastic with each fold. After the final set, let the dough rest, covered, for 1 hour. This final rest allows the gluten to fully relax before shaping, which is crucial for a good oven spring.

Lightly dust a clean work surface with 2 tbsp semolina flour. Turn out the dough and gently shape it into a loose round by pulling the edges toward the center. This pre-shape helps the dough hold its form during the bench rest. Cover the shaped dough and let it rest for 20 minutes—this is called the bench rest.

After the bench rest, shape the dough into a tight boule. To do this, pull the dough toward you in one motion, then cup your hands around it and gently roll it into a smooth, taut ball. The surface should be taut with no cracks or tears. Place the boule seam-side down on a piece of parchment paper dusted with 0.5 cup cornmeal. Cover and let it proof at room temperature for 1-2 hours, or until it has nearly doubled in size.

Preheat your oven to 450°F with the baking stone inside for at least 1 hour. Once the dough has proofed, turn it out onto a piece of parchment paper dusted with 2 tbsp semolina flour. Use a sharp razor blade to score the dough in a simple crosshatch or diagonal pattern—this controls where the dough expands and prevents cracks.

Place the scored dough on the baking stone and immediately cover it with the aluminum foil, sealing the edges tightly to trap steam. Bake for 20 minutes with the foil on to create steam and develop the crust. Then remove the foil and bake for another 20-25 minutes until the crust is deep golden brown and the internal temperature reaches 205-210°F.

Remove the bread from the oven and let it cool on a wire rack for at least 1 hour before slicing. This resting period allows the crumb to fully set and prevents a gummy texture. The exterior should be crisp and crackly, while the interior reveals an open, airy crumb with a slight sheen.

Slice the loaf and serve warm with butter or your favorite jam. The crust should be shatteringly crisp, while the crumb remains tender and open. If you've followed these steps carefully, you'll have a sourdough loaf that rivals any artisanal bakery—every slice a testament to patience and technique.

Storing and reheating your 75 hydration sourdough bread

Room-Temp Storage

Your freshly baked sourdough will stay fresh for 2-3 days at room temperature when stored properly. Wrap the cooled loaf tightly in a clean kitchen towel or beeswax wrap—this traps moisture better than plastic.

Place it in a paper bag to prevent drying out. I store mine on the countertop away from direct sunlight, which helps maintain that perfect crust texture. 🌟

Fridge Preservation

For longer storage, refrigerate your sourdough for up to 5 days in an airtight container. Wrap it first in the kitchen towel, then place in a glass container with a tight lid to prevent moisture loss.

The cold slows staling, but the crust may lose some crispness. To revive, slice and toast or warm in a 350°F oven for 5-10 minutes with a damp paper towel over it.

Freezer Magic

Freezing is ideal for long-term storage—your bread will stay fresh for 3 months. First, let the loaf cool completely. Wrap tightly in plastic wrap, then place in a freezer bag with all air squeezed out.

Label with the date! To use, thaw at room temperature for 2 hours or warm directly from frozen in a 375°F oven for 15-20 minutes with foil covering the first 10 minutes.

Reviving Stale Bread

Even "stale" sourdough can be revived! Preheat your oven to 375°F, slice the bread, and arrange on a baking sheet. Brush with melted butter or olive oil, then bake for 8-10 minutes until golden.

For extra crispiness, sprinkle with coarse sea salt before baking. This works wonders for toast or sandwiches—no waste here! ⚡

Toast Perfection

For the best toast, slice your sourdough ¼-inch thick and toast in a preheated skillet over medium heat for 2-3 minutes per side—this gives a crispier crust than a toaster.