Blueberry Pie with Lemon and Two Thickeners
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Every family has a summer pie that slumped into a purple lake and got eaten with spoons anyway. Flour, cornstarch and four patient hours of cooling are how ours holds a slice.
The short version
Toss 6 cups of blueberries with sugar, flour, cornstarch, lemon and cinnamon. Fill a chilled /pie-crust, cover, chill, and bake at 425°F for 25 minutes, then 375°F until the juices bubble in the middle. Cool 4 hours before slicing.
What makes ours better
why ours wins the argument at dinner
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Thicken with both flour and cornstarch. Cornstarch gives a clear, glossy set and flour adds body, so the filling slices cleanly instead of running across the plate.
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Add lemon juice, zest and a pinch of cinnamon. Lemon brightens the berries so they taste like blueberries, not just sweet. The cinnamon is barely noticeable but rounds it out.
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Start hot, then turn it down. 25 minutes at 425°F sets the crust and gets the filling bubbling fast, then 375°F finishes it without burning the edges.
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Bake until the middle bubbles, then wait four hours. Starch doesn't thicken until it boils, and the filling keeps setting as it cools. Cutting early is the number one cause of a runny pie.
What you need
the stars of the show
- Fresh blueberries6 cups
- Granulated sugar⅔ cup
- All-purpose flour¼ cup
- Ground cinnamon¼ teaspoon
- Finely grated lemon zest1 teaspoon
- Cold unsalted butter1 tablespoon
- All-purpose pie crust1 recipe
Filling
Crust
tap each one as it goes in. no double-salting.
Steps
apron on. phone down. mostly.
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Roll and line the pan
Roll out half the chilled dough into a 12-inch round and fit it into a 9-inch pie plate, leaving the edge hanging over. Roll the second half into a round for the top, slide it onto parchment, and chill both while you make the filling.
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Mix the filling
In a large bowl, stir the sugar, flour, cornstarch, cinnamon and salt together. Add the blueberries, lemon juice and zest and toss until no dry powder is left. Smash a few berries against the side of the bowl to release juice so the starch dissolves. Let it sit 15 minutes.
About 15 min. Cook mode has a timer for this step.
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Fill and top
Pour the filling into the bottom crust, mounding it in the center, and dot with the butter. Cover with the top crust or a lattice. Trim the edges to a 1-inch overhang, fold under, and crimp. Cut 4 or 5 slits in a solid top.
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Chill the assembled pie
Refrigerate the pie for 30 minutes, or freeze it for 15, until the crust is firm. Meanwhile, set a rack in the lower third of the oven, put a baking sheet on the rack below to catch drips, and heat the oven to 425°F.
About 30 min. Cook mode has a timer for this step.
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Brush and start hot
Brush the crust with egg wash and sprinkle with coarse sugar if you like. Set the pie on a second baking sheet and bake at 425°F for 25 minutes, until the crust starts to turn golden.
If the edge is browning quickly, cover it with a ring of foil right away.
About 25 min. Cook mode has a timer for this step.
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Turn it down and finish
Reduce the oven to 375°F and bake until the juices bubble thickly through the vents, including in the center, 40 to 50 minutes more. The filling should reach about 200°F on an instant-read thermometer if you want to check.
Bubbling at the edges isn't enough. Look for slow, thick bubbles in the middle.
About 45 min. Cook mode has a timer for this step.
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Cool for four hours
Move the pie to a rack and let it cool, uncovered, for at least 4 hours. It will look loose at first and set as it cools. Slice with a sharp knife.
About 240 min. Cook mode has a timer for this step.
Good to know
read this before somebody asks for seconds
- Frozen blueberries work. Don't thaw them, toss them in with the sugar and starch, and add 5 to 10 minutes to the bake.
- You can make the filling and chill it up to 24 hours ahead. Fill the crust and bake it from cold.
- Pie will slice more neatly the next day. Reheat slices briefly in a 300°F oven if you want them warm.
- Storage. Covered at room temperature, 2 days. In the fridge, 4 days. Freeze baked slices wrapped for 1 month and thaw overnight.
Questions, answered
asked and answered at the kitchen counter
Why is my blueberry pie runny?
It was cut too soon, or it didn't bake long enough. The filling must bubble thickly in the center to activate the starch, and then it needs 4 hours to set.
Can I use frozen blueberries?
Yes. Use them straight from the freezer so they don't leak extra juice, and bake 5 to 10 minutes longer.
How do I keep the bottom crust from getting soggy?
Bake on a rack in the lower third of the oven, on a preheated baking sheet if you can, and make sure the dough is cold when it goes in. The hot start helps set the bottom.
Can I make blueberry pie ahead of time?
Yes. Bake it the day before and leave it at room temperature, covered loosely. The slices come out cleaner.
Do I need both flour and cornstarch?
You can use only cornstarch (about ⅓ cup), but the combination gives a filling that sets more softly and slices better.
From the table
Made it? Tell me how it went, and who went back for seconds when they thought nobody was looking.
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Published October 29, 2026.