America's Test Kitchen Sourdough Bread Recipe: Artisan Crust With Foolproof Fermentation

America's Test Kitchen sourdough bread recipe delivers restaurant-quality results with a methodical approach that balances tradition and precision. 🌟 The secret lies in mastering fermentation—whether you're maintaining an active starter or perfecting dough development—this recipe eliminates guesswork while preserving the artisanal soul of sourdough.

What sets this apart is the focus on foolproof fermentation, where controlled temperature and timing transform simple ingredients into bread with an open crumb and crisp artisan crust. Even beginners achieve professional results by following the step-by-step process for starter maintenance, bulk fermentation, and final proofing.

The payoff is bread that's golden and crackling on the outside with a tender, airy interior—no dense loaves here. The scoring technique ensures an even rise, while baking at precise temperatures locks in that signature sourdough flavor.

This is the recipe that finally makes home-baked sourdough taste like a Parisian boulangerie.

From troubleshooting weak starters to adapting for high-altitude baking, every detail is covered. Whether you're a first-timer or seasoned baker, this method delivers consistent, restaurant-quality results every time. Let's get started with the foundation of perfect sourdough.

Ingredients for america's test kitchen sourdough bread

Precision meets tradition: these 12 ingredients transform simple fermentation into restaurant-quality sourdough.

The sourdough starter is non-negotiable—this recipe demands a 100% hydration starter that's actively bubbling 24 hours before baking. Professional bakeries use dedicated starters; at home, maintain yours in a glass jar at room temperature (68-72°F ideal). For consistency, King Arthur or Caputo flour yields superior fermentation. The butter must be cold and cubed—never softened—to create that signature crisp crust. If substituting, use European-style butter with 82% fat content for optimal texture. The Diamond Crystal kosher salt is specified for its fine grain, which dissolves evenly without altering dough hydration.

No bread flour? All-purpose plus 1 tbsp vital wheat gluten mimics the protein structure. Short on butter? Olive oil at half the amount works, though flavor differs. The instant-release baking powder ensures predictable rise—Aluminum-free brands like Rumford are ideal. For high-altitude adjustments, increase flour by 1 tbsp per 3,000 feet above sea level. The ice water for final proofing must be exactly 34°F—use a thermometer. Prefer a softer crust? Reduce butter by 1 tbsp and increase water by 1 tbsp. The semolina is optional but essential for bread baskets—Barilla is the gold standard.

Starter scraps can be composted or discarded—never reuse old starter. Store unused flour in an airtight container with a silica gel packet to prevent rancidity. Proofed dough lasts 24 hours in the fridge, developing deeper flavor. For freezing, shape loaves, wrap tightly in plastic wrap, then foil, and bake straight from frozen (add 5-10 minutes). The egg wash must be applied 5 minutes before baking—no earlier, or it steams off. Scored loaves keep 3 days at room temperature in a bread box or towel-lined basket for optimal staling prevention.

Step-by-step instructions for america's test kitchen sourdough bread

Mastering this method guarantees an open crumb, crispy crust, and reliable fermentation every time.

In a large mixing bowl, combine the 1 cup active sourdough starter, 3.5 cups all-purpose flour, 0.5 tsp granulated sugar, and 1.5 tsp diamond crystal kosher salt. Mix with a wooden spoon until no dry spots remain—this ensures even distribution of salt and sugar, which prevent flavor imbalances.

Gradually add the 1.25 cups room-temperature water while mixing. The dough should come together into a shaggy mass that clings to the spoon. For the 0.25 cup unsalted butter, cut it into small cubes and incorporate them last, working the butter into the dough until fully distributed. The butter should be cold enough to resist melting immediately but soft enough to blend smoothly.

Turn the dough onto a lightly floured surface and knead for 8-10 minutes by hand, or use a stand mixer with a dough hook on medium speed for 5-6 minutes. You're aiming for a smooth, elastic dough that springs back slowly when poked—this indicates proper gluten development, which gives the bread its structure and chew.

If the dough feels too sticky, add flour 1 tablespoon at a time until it becomes manageable. Conversely, if it's too dry, add water 1 teaspoon at a time. The ideal dough should be slightly tacky but not wet. Shape the dough into a round and place it back in the mixing bowl, covering it tightly with plastic wrap.

Let the dough bulk ferment at room temperature (70°F) for 4-6 hours, or until it has nearly doubled in size and shows 50-75% rise. During this time, perform two sets of stretch-and-folds—every 30 minutes for the first hour—to strengthen the gluten structure. To do this, wet your hands, grab one side of the dough, stretch it upward, and fold it over itself.

This technique builds tension in the dough, which translates to an open crumb and better oven spring. After the final stretch-and-fold, let the dough rest undisturbed until it reaches the 50-75% rise checkpoint. The dough should feel slightly deflated when pressed gently with a finger, indicating it's ready for shaping.

Turn the dough onto a lightly floured surface and gently shape it into a round loaf. To create surface tension, use the "bench method": fold the dough over itself in thirds, then roll it tightly into a log. Place the shaped loaf seam-side down in a floured proofing basket or a bowl lined with a floured kitchen towel.

Cover the dough loosely with plastic wrap and refrigerate for 12-16 hours or until it has risen to 1.5 times its original size. The cold slow-proofing enhances flavor development and ensures a controlled rise. For the final proof, remove the dough from the fridge and let it sit at room temperature for 1-2 hours until it springs back slowly when poked—this is your signal that it's ready for baking.

Preheat your oven to 450°F with a Dutch oven inside for 45 minutes. Remove the Dutch oven and place it on a heatproof surface. Dust the top of the dough with 0.25 cup semolina flour and score the top with a razor blade in a ½-inch deep crosshatch pattern—this prevents over-expansion and adds visual appeal.

Transfer the dough to the hot Dutch oven, cover tightly with the lid, and bake for 25 minutes. Then remove the lid and bake for an additional 15-20 minutes until the crust is deep golden brown and the internal temperature reaches 205-210°F. Brush the baked loaf with 1 whole egg wash mixed with a splash of water, then sprinkle generously with 1 tsp coarse sea salt for a crispy, flavorful finish.

Remove the bread from the Dutch oven and place it on a wire rack to cool completely for at least 1 hour. This resting period allows the steam to escape, preventing a gummy crumb. For the ultimate texture, let it cool for 2 hours—the longer you wait, the more flavorful and tender the bread becomes.

Once cooled, slice the loaf with a serrated knife and serve. The interior should reveal an open, airy crumb with a crispy, caramelized crust. Store any leftovers wrapped in a bread bag at room temperature for up to 3 days, or freeze for longer storage. This method delivers a bakery-quality loaf with minimal fuss—every time.

Perfect pairings for this recipe

Classic Spreads

Nothing complements fresh sourdough like whipped ricotta mixed with honey and flaky sea salt. Dollop 2 tbsp ricotta per slice, drizzle with 1 tsp wildflower honey, and finish with a pinch of Maldon sea salt. The tangy creaminess cuts through the bread’s crust beautifully.

For a savory option, try garlic-herb butter—mix ¼ cup softened butter with 1 minced garlic clove, 1 tbsp chopped parsley, and ½ tsp lemon zest. 🧈

Sweet Toppings

Elevate your sourdough with fig jam and burrata cheese. Warm 1 tbsp fig jam (I love Bon Appétit brand) in a small pan, then spread over toasted bread. Top with a slice of burrata and cracked black pepper.