# What You’ll Need:
→ Dough
01 - 2 cups bread flour
02 - 1/4 cup granulated sugar
03 - 2 teaspoons fine sea salt
04 - 1 cup whole milk, cold
05 - 1/2 cup active sourdough starter at 100% hydration
06 - 2 tablespoons unsalted butter, softened
→ Butter Block
07 - 1 cup plus 2 tablespoons unsalted butter, cold
→ Egg Wash
08 - 1 large egg
09 - 1 tablespoon milk
# Method:
01 - In a large bowl, combine bread flour, granulated sugar, and fine sea salt. Add cold milk, sourdough starter, and softened butter. Mix until just combined, then knead for approximately 8 minutes until the dough becomes smooth and elastic.
02 - Shape the dough into a rectangle, wrap it in plastic wrap, and refrigerate for at least 2 hours.
03 - Place the cold butter between two sheets of parchment paper. Pound and roll it into a rectangle measuring 8 by 6 inches. Chill until the butter is firm but still pliable.
04 - On a lightly floured surface, roll out the dough to a rectangle measuring 16 by 8 inches. Place the butter block on one half of the dough, fold the other half over it, and seal the edges.
05 - Turn the dough 90 degrees and roll it into a rectangle measuring 24 by 8 inches. Fold into thirds like a letter, wrap in plastic, and chill for 1 hour.
06 - Repeat the rolling and folding process two additional times, chilling for 1 hour between each turn.
07 - After the final fold, wrap the dough and refrigerate overnight for 8 to 12 hours to develop deep sourdough flavor.
08 - Roll the chilled dough into a rectangle measuring 24 by 12 inches and approximately 1/4 inch thick. Cut into 12 long triangles of equal size.
09 - Starting from the wide end of each triangle, roll tightly into a crescent shape, tucking the pointed tip underneath. Arrange on parchment-lined baking sheets.
10 - Cover the croissants loosely with a kitchen towel and proof at room temperature until doubled in size, approximately 2 to 3 hours.
11 - Set the oven to 400°F (200°C) and allow it to reach the target temperature.
12 - Whisk the egg and milk together in a small bowl. Brush the egg wash mixture lightly over each croissant using a pastry brush.
13 - Bake for 18 to 22 minutes until the croissants develop a golden brown and crisp exterior. Allow to cool slightly before serving.