What technique bakes the bottom pastry base before filling to prevent sogginess?

Blind-baking is the technique of baking a pastry base before adding its filling, helping prevent the bottom crust from becoming soggy. The crust is partially or fully baked on its own, often with weights to keep it from puffing or collapsing.

Moist apple fillings release juice as the fruit cooks. If raw pastry is filled immediately, that liquid can soak into the base before the crust has developed a firm, crisp structure. Blind-baking creates a more stable barrier and is especially useful when a recipe calls for a delicate or especially juicy filling.

The method is not the same as proofing, which develops yeast dough; tempering, which controls temperature in ingredients such as chocolate; or parboiling, which partially cooks food in water. Apple pie can also be assembled without blind-baking, particularly when the filling and crust are designed to bake together. In that case, venting, thickening the filling, and choosing suitable apples help manage excess moisture.