Dough Ingredients: – all-purpose flour – active sourdough starter – full-fat milk
In a stand mixer bowl, combine the flour, sourdough starter, milk, sugar, salt, and egg. Mix on low speed until no dry flour remains.
Add the butter one tablespoon at a time, allowing each piece to fully incorporate before adding more. This helps the dough become smooth and elastic.
Knead on medium-low for about 20 minutes, or until the dough passes the windowpane test and feels supple and strong.
Cover the dough and let it rest for 30 minutes. Perform 2–3 rounds of stretch-and-folds, spaced 30 minutes apart.
Mix the softened butter, brown sugar, cinnamon, and cardamom into a paste. Stir by hand—don’t whip it. You want a thick, spreadable texture.