# What You'll Need:
→ Dough
01 - 2 1/2 cups all-purpose flour
02 - 1/4 cup granulated sugar
03 - 1/2 teaspoon fine sea salt
04 - 1/2 cup active sourdough starter, fed and bubbly
05 - 1/2 cup whole milk, lukewarm
06 - 2 large eggs, room temperature
07 - 1/4 cup unsalted butter, softened
→ Filling
08 - 1/2 cup granulated sugar
09 - 2 tablespoons finely grated lemon zest
10 - 1 cup fresh blueberries
11 - 2 tablespoons unsalted butter, melted
→ Lemon Glaze
12 - 1 cup powdered sugar
13 - 2 to 3 tablespoons fresh lemon juice
# Directions:
01 - In a large bowl, combine the flour, sugar, and salt. In a separate bowl, whisk together the sourdough starter, lukewarm milk, and eggs. Add the wet mixture to the dry ingredients, then mix in the softened butter. Knead by hand or with a stand mixer for 7 to 10 minutes until smooth and elastic.
02 - Cover the dough with plastic wrap or a damp towel. Let rise at room temperature for 6 to 8 hours, or overnight, until doubled in size.
03 - In a small bowl, mix the sugar and lemon zest until fragrant.
04 - On a lightly floured surface, roll out the dough into a 12 by 18 inch rectangle. Brush with melted butter. Evenly sprinkle the lemon sugar over the dough and scatter blueberries on top.
05 - Cut the dough into six 3 inch wide strips. Stack the strips on top of each other, then cut into six even squares. Arrange the squares vertically, cut sides up, in a greased 9 by 5 inch loaf pan.
06 - Cover and let rise for 1 to 2 hours until puffy.
07 - Preheat oven to 350°F. Bake for 35 to 40 minutes, or until golden brown and cooked through. If browning too quickly, cover loosely with foil for the last 10 minutes.
08 - Let cool in the pan for 15 minutes, then remove to a wire rack. Whisk together powdered sugar and lemon juice for the glaze, then drizzle over the warm bread before serving.