Rhubarb Blueberry Pie with a Buttery Flaky Crust
This Rhubarb Blueberry Pie layers tart rhubarb with juicy blueberries in a golden, flaky crust for a stunning summer dessert that tastes as good as it looks.
The Summer Pie You Did Not Know You Were Missing
If you have never paired rhubarb and blueberries together in a pie, get ready for a revelation. Tart, almost savory rhubarb and sweet, jammy blueberries are one of those magical flavor combinations that make warm-weather baking completely irresistible. This rhubarb blueberry pie has the kind of bubbling, ruby-red filling and shatteringly flaky crust that earns you serious compliments at every summer gathering.
Whether you came here searching for a classic Blueberry Rhubarb Pie Recipe, a bold Rhubarb Berry Pie to show off at a potluck, or just a reliable way to use up whatever rhubarb is piling up in your garden, this recipe has you covered.
Using the right tools really does make a difference when it comes to homemade pie. A quality pastry cutter helps you achieve those perfect flaky layers, and a heavy ceramic pie dish distributes heat evenly so the bottom crust actually bakes through instead of staying pale and soggy.
Why This Combination Works So Well
Rhubarb on its own is bracingly tart. Blueberries on their own can be quite sweet. Together, they find a beautiful balance that requires very little sugar to taste extraordinary. A little lemon zest and vanilla extract in the filling lift everything and add a subtle brightness that makes this pie taste sophisticated without being fussy.
This is also a wonderfully forgiving recipe for beginner pie bakers. The filling is as simple as tossing fruit with sugar and cornstarch, and even a rustic, free-form lattice top looks stunning once it comes out of the oven golden and bubbling.
Chef's Tip: Do not skip macerating the fruit for 10 minutes before filling the crust. This draws out some of the juice so the cornstarch can absorb it evenly, which means a filling that slices cleanly instead of flooding your plate.
Tips for the Flakiest Butter Crust
The secret to a truly flaky crust is cold fat and minimal handling. Here is what actually matters:
- Keep your butter cubed and in the freezer for 15 minutes before you start.
- Use genuinely ice-cold water, not just tap water.
- Stop mixing the dough the moment it holds together. Overworking develops gluten and leads to a tough, cracker-like crust.
- Chilling the dough for at least an hour (or overnight) is not optional. It relaxes the gluten and keeps the butter cold so it steams in the oven and creates those gorgeous flaky layers.
If you have ever tried a Blueberry Rhubarb Upside-Down Cake or a rustic Saskatoon Rhubarb Pie, you already know how beautifully rhubarb performs in baked desserts. This double-crust pie might just become your new favorite among all your rhubarb and blueberry recipes.
Choosing Your Fruit
Fresh is best when rhubarb is in season, typically late spring through early summer. Look for stalks that are firm and brightly colored. Frozen rhubarb and blueberries both work well as a substitute, just add a little extra cornstarch and do not thaw the fruit before using.
If you enjoy exploring blueberry rhubarb recipes beyond pie, this same filling is wonderful spooned over vanilla ice cream, stirred into oatmeal, or layered into a crisp.
Ready to make it? Here is the full step-by-step recipe:
Rhubarb Blueberry Pie with a Buttery Flaky Crust
This Rhubarb Blueberry Pie layers tart rhubarb with juicy blueberries in a golden, flaky crust for a stunning summer dessert that tastes as good as it looks.
Ingredients
- 2 1/2 cups all-purpose flour, plus more for dusting
- 1 tbsp granulated sugar, for the crust dough
- 1 tsp salt, fine sea salt
- 1 cup unsalted butter, cold and cubed
- 6 tbsp ice water, add one tablespoon at a time
- 3 cups fresh rhubarb, trimmed and sliced into 0.5-inch pieces
- 2 cups fresh blueberries, rinsed and dried
- 3/4 cup granulated sugar, for the filling, adjust to taste
- 3 tbsp cornstarch, helps thicken the fruit filling
- 1 tbsp lemon juice, freshly squeezed
- 1 tsp lemon zest, from about half a lemon
- 1/2 tsp vanilla extract, pure vanilla preferred
- 1 large egg, beaten with 1 tsp water for egg wash
- 1 tbsp coarse sugar, for sprinkling on top crust
Instruction
Make the pie dough: Whisk together the flour, 1 tablespoon of sugar, and salt in a large bowl. Add the cold cubed butter and use a pastry cutter or your fingertips to work it into the flour until the mixture resembles coarse crumbs with some pea-sized butter pieces remaining.
Drizzle in the ice water one tablespoon at a time, mixing gently with a fork after each addition, until the dough just comes together and holds when pressed. Divide into two equal discs, wrap each in plastic wrap, and refrigerate for at least 1 hour or overnight.
Preheat the oven to 400 degrees F (205 degrees C). Place a rimmed baking sheet on the lower oven rack to catch any drips.
Make the filling: In a large bowl, combine the sliced rhubarb, blueberries, 0.75 cup sugar, cornstarch, lemon juice, lemon zest, and vanilla extract. Toss gently until the fruit is evenly coated. Set aside to macerate for 10 minutes.
On a lightly floured surface, roll out one dough disc into a 12-inch circle. Carefully transfer it to a 9-inch pie dish, pressing it gently into the bottom and up the sides. Trim any overhang to about 1 inch.
Pour the rhubarb blueberry filling into the prepared crust, spreading it into an even layer.
Roll out the second dough disc into a 12-inch circle. Lay it over the filling, or cut it into strips for a lattice top. Trim and crimp the edges to seal. Cut a few small slits in the top crust to allow steam to vent.
Brush the top crust with the egg wash and sprinkle generously with coarse sugar.
Bake on the preheated baking sheet for 20 minutes at 400 degrees F, then reduce the oven temperature to 350 degrees F (175 degrees C) and bake for an additional 30 to 35 minutes, until the crust is deep golden brown and the filling is bubbling through the vents.
Transfer the pie to a wire rack and allow it to cool for at least 2 to 3 hours before slicing. This resting time is essential so the filling sets properly.
Equipment
- 9-inch pie dish
- Large mixing bowl
- Pastry cutter or food processor
- Rolling pin
- Rimmed baking sheet
- Pastry brush
- Wire cooling rack
- Plastic wrap
Notes
Serving and Storing Your Pie
Patience is the final ingredient. Let the pie cool on a wire rack for at least 2 to 3 hours before cutting. The filling continues to set as it cools, and slicing too early will result in a soupy mess, no matter how good it smells.
Serve slices with a generous scoop of vanilla ice cream or a dollop of lightly sweetened whipped cream. Leftovers keep at room temperature for 2 days or in the refrigerator for up to 5 days, though in our experience this pie rarely survives that long.
