Koji-Fermented Butter and Ancient Grain Crust Recipe
Crisp, tangy ancient grain pastry crust made with nutty koji-fermented butter delivers complex umami depth and a spectacular flaky texture that shatters deliciously with each bite.
Ingredients
<ul class="ingredients-main-list"><li class="ingredients-single-item">For the Koji-Fermented Butter:</li><li class="ingredients-single-item">250g high-quality unsalted butter, room temperature</li><li class="ingredients-single-item">50g rice koji (shio koji without salt)</li><li class="ingredients-single-item">For the Ancient Grain Crust:</li><li class="ingredients-single-item">140g ancient grain flour blend (equal parts spelt, einkorn, and farro flour)</li><li class="ingredients-single-item">70g whole grain kamut flour (or additional spelt)</li><li class="ingredients-single-item">30g amaranth flour</li><li class="ingredients-single-item">180g koji-fermented butter, cold and cubed</li><li class="ingredients-single-item">5g sea salt</li><li class="ingredients-single-item">80ml ice-cold water</li><li class="ingredients-single-item">15ml apple cider vinegar</li></ul>
Equipment
<ul class="equipment-main-list"><li class="equipment-single-item">Food processor</li><li class="equipment-single-item">Sterilized glass jar with lid</li><li class="equipment-single-item">Pastry cutter or bench scraper</li><li class="equipment-single-item">Pastry brush</li><li class="equipment-single-item">Rolling pin</li><li class="equipment-single-item">Baking stone or heavy baking sheet</li></ul>
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Directions
<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>Begin by preparing the koji-fermented butter three days before you plan to make the crust. In a food processor, combine room temperature butter with rice koji and pulse until thoroughly incorporated. The koji will begin to break down the fats and proteins in the butter, creating complex flavor compounds and a slight tanginess.</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>Transfer the butter-koji mixture to a sterilized glass jar, press down to remove air pockets, and cover with a lid. Allow to ferment at room temperature (around 20-22°C) for 48 hours, then refrigerate for an additional 24 hours to halt fermentation and firm up the butter.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>For the ancient grain crust, combine all flours and salt in a large bowl, whisking thoroughly to distribute the ingredients evenly. The variety of ancient grains provides complex flavors and unique protein structures that will contribute to a tender yet sturdy final crust.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>Cut the cold koji-fermented butter into 1cm cubes and add to the flour mixture. Using a pastry cutter or your fingertips, work quickly to incorporate the butter until the mixture resembles coarse crumbs with some pea-sized pieces remaining. These larger butter pieces will create steam pockets during baking, resulting in delicious flaky layers.</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>Mix the ice-cold water with apple cider vinegar (the acid helps inhibit gluten development for a more tender crust). Drizzle this over the flour-butter mixture and gently toss with a fork until the dough just begins to come together. It should appear shaggy and somewhat dry - resist the temptation to add more water as ancient grains absorb moisture differently than conventional flour.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>Turn the dough onto a lightly floured surface and press it together, folding it over itself 3-4 times to create layers. This gentle lamination will enhance the flakiness. Form into a disk about 2.5cm thick, wrap tightly in compostable plastic wrap, and refrigerate for at least 1 hour or up to 2 days. This resting period allows the flour to fully hydrate and the glutenin proteins to relax.</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>When ready to bake, preheat your oven to 200°C with a baking stone or heavy baking sheet inside. Roll the chilled dough on a lightly floured surface to your desired thickness (about 3-4mm is ideal). The dough may be slightly more fragile than conventional pastry due to the lower gluten content of ancient grains, so handle with care.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>For blind baking (an empty shell), line your crust with parchment and fill with baking weights. Bake at 200°C for 15 minutes, then remove weights and bake for another 10-12 minutes until golden brown and fully cooked. The crust should smell wonderfully nutty with complex fermented notes from the koji butter. Cool completely before filling.</li></ol>
Chef’s Notes
A few helpful details for making this recipe.
Why does fermented butter create a better pastry crust?
Fermented butter introduces complex umami flavours and slight acidity that enhances the overall taste profile. The fermentation process also breaks down fats and proteins in the butter, creating natural emulsifiers that improve the crust's texture and flakiness while adding remarkable depth.
Can I substitute regular wheat flour for the ancient grain blend?
Yes, though you'll lose some nutritional benefits and flavour complexity. If substituting, use 200g all-purpose flour and 40g whole wheat flour. The texture will be different—ancient grains create a nuttier, more textured crust with less gluten development.
How long can I store the koji-fermented butter?
Properly fermented koji butter will keep in an airtight container in the refrigerator for up to 2 weeks. You can also freeze it for up to 3 months. The fermented flavours will continue to develop slightly even when refrigerated, becoming more complex over time.
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