Acme Sourdough Bread Recipe: Artisan Crust With Foil-Sealed Juice Lock

Mastering sourdough bread begins with patience and precision—this Acme sourdough recipe delivers an artisan crust with a foil-sealed juice lock that traps moisture for days. The secret lies in a well-maintained starter and controlled fermentation, transforming simple flour and water into bread with an open crumb structure and deep flavor.

Every step, from feeding your starter to scoring the dough, builds toward that perfect golden crust and tender interior.

What sets this recipe apart is the foil-sealed method, which creates a steam chamber during baking. This technique locks in juices, ensuring your loaf stays moist long after it cools—no dry, stale bread here.

The dough undergoes bulk fermentation for 4-6 hours, allowing gluten to develop fully and flavors to mature. Even beginners can achieve professional results with these clear, step-by-step instructions and pro tips.

By the time you pull that loaf from the oven, you’ll have a crusty exterior with a satisfying crackle and a soft, airy interior that crumbles beautifully. The aroma alone—warm, tangy, and slightly sweet—will make your kitchen feel like a Parisian boulangerie.

This isn’t just bread; it’s a labor of love that elevates any meal from ordinary to extraordinary.

The best part? Once you’ve perfected this classic version, you can experiment with whole grains, seeds, or herbs to customize it to your taste. Let’s get started on your first loaf—your kitchen (and taste buds) will thank you.

Ingredients for acme sourdough bread

Fourteen ingredients, zero shortcuts—just flour, water, and time for perfect artisan sourdough.

The flour is non-negotiable here. King Arthur or Caputo bread flour are my go-tos—they have the protein content needed for that signature open crumb. If you're using all-purpose, add 1 extra teaspoon of vital wheat gluten. Your starter should be 100% hydration and bubbly with a slight tang—if it smells like alcohol or vinegar, it's overproofed. For the water, filtered is best to avoid flavor interference, but tap water works in a pinch if you're in a hard-water area. The honey isn't just for sweetness—it helps control fermentation speed and adds subtle depth to the flavor. Local raw honey from a farmers market gives the best results, but any raw variety will do.

No honey? Maple syrup at half the amount works, but expect slightly different flavor notes. Running low on flour? Whole wheat or rye at 10-15% replacement adds nutrition without wrecking the structure. The foil is where the magic happens—heavy-duty Reynolds is my standard, but any brand works as long as it's thick. For scoring, a fresh razor blade gives the cleanest cuts, but a lame works too if you're feeling traditional. The baking stone? Preheat it alongside your oven—this is critical for that perfect crust. If you don't have one, a Dutch oven with lid is the next best thing, but you'll need to adjust your baking time slightly.

This dough is a beast—it needs 48 hours from start to finish, but trust me, it's worth it. Store your starter in the fridge between feedings to slow fermentation. The shaped loaf keeps 2-3 days at room temperature wrapped in a cotton towel, or 1 week in the fridge. For longer storage, freeze the loaf unwrapped—it'll stay fresh for 3 months. The foil-sealed method means you can pull it from the oven, wrap it immediately, and it'll stay moist for days. Pro tip: Score the loaf right before baking—the steam from the foil will make it rise beautifully along those cuts.

Step-by-step instructions for artisan sourdough bread with foil-sealed crust

Here's how to create a loaf with a crackling crust and ultra-juicy interior using the Acme method.

In a large mixing bowl, combine the 3.5 cups unbleached bread flour and the 1 cup active sourdough starter. Using your hands or a dough whisk, mix just until the starter disappears into the flour—this prevents overdevelopment of gluten at this stage. Create a well in the center and add the 2.25 cups room temperature filtered water and 0.5 tsp honey. Mix with a wooden spoon or your hands until just combined into a shaggy dough.

Cover the bowl with a damp kitchen towel and let rest for 30 minutes. This initial rest period, called autolyse, allows the flour to fully hydrate and begin gluten development. You'll notice the dough transform from loose and sticky to more cohesive and elastic. This step is crucial for creating the open crumb structure that makes sourdough so satisfying.

After the autolyse, sprinkle the 1.5 tsp kosher salt evenly over the dough. Using wet hands to prevent sticking, perform a series of stretch-and-folds. Wet your hands first—this prevents the dough from sticking to your fingers and helps strengthen the gluten structure. Reach into the center of the dough, grab a portion, stretch it upward, and fold it over itself. Rotate the bowl and repeat this process 4-5 times, working from different angles.

This technique builds gluten gradually without overworking the dough. Cover the bowl again and let rest for 30 minutes. The dough should now be more elastic and slightly less sticky. If it's still too wet to handle easily, you can add an additional 1 tablespoon flour, but try to work with what you have first—this helps develop better flavor.

Remove the dough from the bowl and place it on a lightly floured surface. Wet your hands again and perform another set of stretch-and-folds, this time doing 3-4 sets with 5-minute intervals between each set. After the final fold, shape the dough into a loose round by pulling the edges toward the center and tucking them underneath. Place it back in the bowl, cover, and let ferment at room temperature for 4-5 hours.

During this bulk fermentation, the dough should roughly double in size. You'll know it's ready when it passes the "poke test"—press your finger gently into the dough; if it springs back slowly (about 1-2 seconds), it's ready. The dough should also be noticeably puffier and have small bubbles visible on the surface. This is where the magic happens—the yeast and bacteria in your sourdough starter work their flavor magic during this time.

Turn the fermented dough onto a lightly floured surface. Pre-shape it into a rough oval by folding the edges toward the center and sealing the seams. Let it rest for 20-30 minutes while you prepare your baking setup. Preheat the baking stone in your oven to 475°F for at least 1 hour. Line a baking sheet with the 1 sheet aluminum foil and dust it generously with 0.25 cup cornmeal.

After the bench rest, shape the dough into a tight boule (round shape) or batard (oval shape). For a boule, pull the dough toward you while rotating the bowl, tucking the edges under as you go. For a batard, roll it into a log shape. Place the shaped dough seam-side up on the prepared baking sheet. Cover loosely with plastic wrap and refrigerate for 12-16 hours or up to 24 hours. This cold proof creates a more open crumb structure and allows for better flavor development.

Remove the dough from the refrigerator and let it come to room temperature for 1-2 hours. Preheat your oven to 475°F with the baking stone inside. Once the dough has risen noticeably (it should have puffed up about 25-30% from its shaped size), score the top with the lame or razor blade using a sharp, confident motion. For a boule, make a single deep cut; for a batard, make 2-3 parallel cuts.

Quickly transfer the scored dough to the preheated baking stone. Bake for 20 minutes uncovered, then place the 1 sheet aluminum foil over the loaf, creating a seal to trap steam. This juice lock technique creates that signature sourdough crust while keeping the interior moist. Bake for an additional 25-30 minutes until the internal temperature reaches 205-210°F and the crust has a deep golden brown color.

Remove the loaf from the oven and let it cool on a wire rack for at least 1 hour. This resting period allows the steam inside to redistribute, preventing a gummy crumb. For even better results, place 0.5 cup ice cubes in a bowl and set the warm loaf on top for 5 minutes—this creates a crispier crust. Brush the cooled loaf with 1 tsp olive oil for added shine and flavor.

Slice your sourdough with a serrated knife and admire the open crumb structure and crackling crust. The foil-sealed technique should have created a beautiful oven spring with a crisp exterior and moist, flavorful interior. Store wrapped at room temperature for up to 3 days or freeze for longer storage. This method delivers that bakery-quality sourdough you've been craving right in your own kitchen.

Essential equipment for perfect results

Starter Essentials

Your sourdough starter is the heart of this recipe, so equip yourself with a glass jar (I use a 1-quart Ball jar) for easy monitoring.

A digital kitchen scale (like the OXO Good Grips) ensures precise measurements for your starter's feedings—1:1:1 ratio of flour to water to starter by weight is ideal. Keep a small notebook nearby to track feedings and fermentation times, which helps you spot patterns in your starter's behavior. 🌱

Mixing and Fermentation Tools

A large mixing bowl (at least 5-quart capacity) with a damp kitchen towel and elastic band keeps your dough cozy during bulk fermentation. For shaping, a lightly floured surface (I use a marble slab or wooden board) prevents sticking.

A dough whisk (like the West Bend) saves your hands during the autolyse stage, while wet hands become your best friend for stretch-and-folds. 💪

Baking Setup Must-Haves

The baking stone (I swear by the Greatjoy Ceramic) is non-negotiable—it mimics a professional oven's heat retention. Preheat it alongside your oven for at least 1 hour to reach 475°F.

For scoring, a sharp lame (like the La Cloche) gives clean cuts, but a razor blade works in a pinch. Line your baking sheet with heavy-duty aluminum foil (I use Reynolds) to create the juice lock during baking.

A wire cooling rack (like the OXO Good Grips) ensures proper airflow as your loaf cools. 🔥

Pro Tips for Handling

Keep ice cubes on hand for the 5-minute crust crisping trick—place 0.5 cup in a bowl and set your warm loaf on top post-baking. A small spray bottle with water helps prevent dough from sticking during shaping.

For storage, a cotton bread bag (like the Amazon Basics) keeps your loaf fresh longer than plastic. And don’t forget olive oil—a 1 tsp brush adds shine and flavor to the final loaf. 💫

Budget-Friendly Swaps

No baking stone? A Dutch oven (like the Le Creuset) works wonders—just adjust baking time by 5-10 minutes. Skip the lame? A serrated knife or even a sharp kitchen scissors can score your dough.

For scaling, a measuring cups and spoons set (like the Pyrex) works in a pinch, though a scale gives more consistent results. The foil-sealed method still shines with these swaps! 💡

Frequently asked questions