Lemon Blueberry Sourdough Swirl (Printable version)

A tangy loaf bursting with fresh blueberries and bright lemon zest, perfectly swirled in soft sourdough.

# What You Need:

→ Dough

01 - 3 cups bread flour
02 - 1/2 cup active sourdough starter at 100% hydration
03 - 1 cup whole milk, lukewarm
04 - 1/4 cup unsalted butter, softened
05 - 1/4 cup granulated sugar
06 - 1 large egg
07 - 1 teaspoon fine sea salt
08 - Zest of 1 lemon

→ Blueberry Lemon Swirl

09 - 1 cup fresh or frozen blueberries
10 - 1/4 cup granulated sugar
11 - 2 tablespoons lemon juice
12 - 1 tablespoon cornstarch

→ Optional Glaze

13 - 1/2 cup powdered sugar
14 - 1 to 2 tablespoons lemon juice

# How to Make It:

01 - In a small saucepan, combine blueberries, sugar, and lemon juice. Cook over medium heat, stirring frequently, until the berries burst and release their juice, approximately 5 to 7 minutes. Stir in cornstarch and continue cooking for 1 to 2 minutes until the mixture thickens. Transfer to a bowl and allow to cool completely.
02 - In a large bowl or stand mixer, combine lukewarm milk, sourdough starter, softened butter, sugar, egg, salt, and lemon zest. Mix until ingredients are incorporated. Gradually add flour and knead for 8 to 10 minutes until the dough becomes smooth and elastic.
03 - Place the dough in a lightly greased bowl and cover with a damp cloth. Let rise at room temperature until doubled in size, approximately 4 to 6 hours depending on starter activity.
04 - Turn the dough onto a floured surface and roll into a 9 by 16 inch rectangle. Spread the cooled blueberry swirl evenly over the dough, leaving a 1 inch border on all sides.
05 - Roll the dough tightly from the short end to form a log. Place seam-side down in a greased 9 by 5 inch loaf pan.
06 - Cover the pan with a damp cloth and let rise at room temperature for 1 to 2 hours, until the dough is puffy and nearly doubled in height.
07 - Preheat oven to 350 degrees Fahrenheit. Bake for 35 to 40 minutes, until the loaf is golden brown and sounds hollow when tapped on the bottom.
08 - Once the loaf has cooled, mix powdered sugar and lemon juice to reach a drizzling consistency. Drizzle the glaze over the cooled bread.

# Expert Advice:

01 -
  • The sourdough starter gives you that complex tang that store-bought bread can't touch, while lemon and blueberries keep it bright and not heavy.
  • Those swirled bursts of fruit make every slice feel like a small celebration, and somehow the same loaf tastes different depending on which piece you cut.
02 -
  • Starter temperature and activity level change everything; a sluggish starter might need 8 hours for the first rise while an eager one finishes in 4, so observe your dough rather than watching the clock.
  • The cooling step for the blueberry swirl is non-negotiable because warm filling will make your dough sticky and collapse your beautiful swirl into mush.
03 -
  • Use a bench scraper when rolling the dough; it prevents sticking far better than using your floury hands, and you'll develop more intuition for dough texture.
  • Taste your blueberry swirl before it cools; if it needs more tartness, add lemon juice now rather than trying to adjust after it's set into the dough.
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