Buttermilk Puff Pastry

Why This Buttermilk Puff Pastry Works

Cold butter and cold buttermilk are what give this pastry its flaky layers. When the butter cubes are rubbed into the flour, some pieces blend in and coat the flour, but many small chunks stay whole. Those little bits of butter are trapped all through the dough. As the dough is rolled and folded again and again, the butter pieces flatten into thin sheets and stack between layers of dough.

During baking, the water in the buttermilk and in the butter starts to steam. That steam pushes the dough layers apart, so the pastry puffs up instead of staying flat. At the same time, the flour around the butter firms up and holds those air pockets in place. Chilling between folds keeps the butter from melting into the flour too soon, so it stays in pieces and can still puff. By the time the pastry is baked, all those thin layers stay separate, crisp, and tender.

Mistakes To Avoid

Using butter that is even slightly soft turns the dough heavy instead of flaky. The butter smears into the flour instead of staying in little cold pieces, so it melts too fast in the oven and the pastry bakes up flat and greasy instead of puffed with visible layers.

Adding all the buttermilk at once often leads to a sticky, over-wet dough. Once it gets gummy, extra flour has to be worked in, which means more kneading, and the layers get pressed together so the pastry bakes up dense instead of light.

Working the butter fully into fine crumbs in step 2 removes the chunks that create lift. When every bit of butter is rubbed in, there are no pockets left to steam and separate the layers, so the finished pastry looks more like a regular pie crust than puff pastry.

Skipping or rushing the chilling between folds keeps the butter too warm and soft. Instead of forming clean sheets between layers of dough, the butter blends in, and in the oven the pastry spreads outward and stays low instead of rising.