This is a buttery and flavorful brioche dough recipe suitable for loaves and donuts.

Ingredients

• 450 gram bread flour (12% protein)
• 3 eggs medium size
• 150 gram sourdough starter 100% hydration
• 35 grams water
• 60 gram buttermilk
• 230 grams butter, cubed and softened (approx 2 sticks)
• 30 gram sugar
• 20 gram sea salt

Directions

Prepare a starter and allow to ripen. When the starter passes a float test, combine starter, water, buttermilk, flour, salt and sugar in the bowl of a stand mixer and affixed with a dough hook. With the mixer on low, add eggs one by one until a rough, shaggy dough forms. Rest 1 hour.

With the mixer on medium, add cubes of butter one by one, allowing each cube to completely incorporate before adding the next. Scrape down the sides of the mixer occasionally. The dough should become silky smooth and elastic. Cover with plastic wrap and rest until dough has expanded by 30%, about 4 hours. Performing a stretch and fold approximately each hour until the gluten stiffens.

Cover in an airtight container and ferment refrigerated up to 2 days before shaping.

After fermentation, warm the dough to room temperature and shape. Allow to rise until doubled in size. If baking, brush down with egg white and bake in a 375°F oven 25-30 minutes, until a temperature probe inserted to the center of the loaf registers 209°F. Allow to fully cool before slicing.