Blueberries shine in this pie. The pie is lightly sweetened with a touch of spice from allspice and cinnamon. To top the pie, we like to add a lattice crust. It is simpler than it may seem; instructions are provided below. If preferred, a full sheet of pastry can be used; just cut a few slits to allow steam to escape. The pie is finished baking when the filling juices are bubbling eagerly. Removing the pie before the filling bubbles will result in a thin filling that runs out of the pie when sliced. A flaky pie crust recipe can be used, a favorite recipe, or store-bought crust.
Blueberries shine in this pie. The pie is lightly sweetened with a touch of spice from allspice and cinnamon. To top the pie, we like to add a lattice crust. It is simpler than it may seem; instructions are provided below. If preferred, a full sheet of pastry can be used; just cut a few slits to allow steam to escape. The pie is finished baking when the filling juices are bubbling eagerly. Removing the pie before the filling bubbles will result in a thin filling that runs out of the pie when sliced. A flaky pie crust recipe can be used, a favorite recipe, or store-bought crust.
Adding frozen blueberries directly to a pie without accounting for their excess moisture will result in a watery filling that refuses to set. Fresh fruit contains less cellular water than frozen fruit, making two pounds of fresh blueberries the superior choice for maintaining structural integrity in a starch-thickened pastry. When tumbling the berries with sugar, cornstarch, and lemon zest, the sugar draws out just enough liquid to hydrate the starch granules without flooding the pan. Cornstarch requires adequate heat to gelatinize fully, which is why the filling must bubble eagerly during baking. If the juices only simmer sluggishly, the starches remain raw and the liquid will run uncontrollably across the plate upon slicing. Rolling the dough requires keeping the fat cold; if kitchen temperatures exceed seventy degrees Fahrenheit, slide the dough back into the refrigerator for ten minutes to firm up the butter particles. Those solid pockets of fat melt during the oven phase, creating steam pockets that yield a flaky, layered crust rather than a tough, dense shell. Positioning a pre-heated baking sheet on the lower third of the oven catches any bubbling overspill while providing direct bottom heat to crisp the undercrust. Brushing the lattice strips with a mixture of egg yolk and heavy cream promotes browning through the Maillard reaction while anchoring the coarse sugar granules to the surface. Allowing the baked pie to rest undisturbed for three hours on a wire rack permits the internal temperature to drop and the starch network to contract fully, transforming a loose compote into a sliceable wedge.