The Best Rhubarb and Raspberry Crumble Pie Recipe

Welcome to the ultimate guide for creating a spectacular Rhubarb and Raspberry Crumble Pie, a perfect marriage of tart spring rhubarb and sweet summer raspberries under a buttery, crunchy topping. This recipe balances the bright tanginess of the fruit filling with a comforting, golden-brown crumble, making it the ideal dessert for any occasion.

Why You Will Love This Recipe

This Rhubarb and Raspberry Crumble Pie is a showstopper that tastes like springtime magic. The combination of tart rhubarb and sweet raspberries creates a perfectly balanced fruit filling that isn’t overly sweet. The buttery, oat-flecked crumble topping provides irresistible texture contrast to the soft, jammy interior. It’s surprisingly easy to assemble, uses seasonal ingredients beautifully, and fills your kitchen with an incredible, inviting aroma while baking.

Ingredients

• Pie Filling: 3 cups fresh or frozen rhubarb, chopped into 1-inch pieces
• Pie Filling: 2 cups fresh or frozen raspberries
• Pie Filling: 3/4 cup granulated sugar (adjust based on fruit tartness)
• Pie Filling: 1/4 cup all-purpose flour or cornstarch (for thickening)
• Pie Filling: 1 teaspoon pure vanilla extract
• Pie Crust: 1 recipe double-crust pie dough (store-bought or homemade)
• Crumble Topping: 1 1/2 cups all-purpose flour
• Crumble Topping: 1 cup rolled oats (not instant)
• Crumble Topping: 3/4 cup packed light brown sugar
• Crumble Topping: 1/2 teaspoon ground cinnamon
• Crumble Topping: 1/2 cup (1 stick) cold, unsalted butter, cut into small cubes

Step-by-Step Instructions

1. Prepare the Crust: Preheat your oven to 375 degrees F (190 degrees C). If using homemade dough, roll out one disk of pie dough and fit it into a standard 9-inch pie dish. Trim and crimp the edges. Place the pie dish in the refrigerator while preparing the filling.
2. Make the Fruit Filling: In a large bowl, gently toss the chopped rhubarb and raspberries with the granulated sugar, flour (or cornstarch), and vanilla extract until everything is evenly coated. Allow the mixture to sit for about 10 minutes to start releasing juices.
3. Assemble the Filling: Pour the fruit mixture into the chilled pie crust, spreading it evenly.
4. Prepare the Crumble Topping: In a separate medium bowl, whisk together the flour, rolled oats, brown sugar, and cinnamon for the topping.
5. Cut in the Butter: Add the cold, cubed butter to the dry ingredients. Use your fingertips, a pastry blender, or two knives to cut the butter into the flour mixture until coarse crumbs form. You should have some pea-sized pieces of butter remaining.
6. Top the Pie: Sprinkle the entire crumble mixture evenly over the fruit filling in the pie dish, ensuring the fruit is completely covered.
7. Bake: Place the pie on a baking sheet (to catch any drips) and bake for 50 to 65 minutes. If the crumble topping begins to brown too quickly, loosely cover the pie edges or the entire pie with aluminum foil after about 40 minutes. The pie is done when the crust is golden brown and the filling is bubbling thickly in the center.
8. Cool: Carefully remove the pie from the oven and let it cool on a wire rack for at least 3 to 4 hours before slicing. This cooling time is crucial for the filling to set properly.

Expert Tips / Pro Tips

• Preventing Soggy Bottoms: Brush the bottom pie crust lightly with an egg wash (one beaten egg white) before adding the filling. This creates a barrier against the fruit juices.
• Keep the Butter Cold: For the best, crispiest crumble topping, ensure your butter is very cold when cutting it into the dry ingredients. Cold butter creates steam pockets that result in a lighter, flakier texture.
• Thickening Power: If your rhubarb is particularly juicy, use cornstarch instead of flour in the filling, as it provides superior thickening power when baking.
• Use Frozen Fruit Wisely: If using frozen fruit, do not thaw it first. Toss it directly into the sugar and flour mixture from the freezer; this prevents the fruit from becoming too mushy during the initial cooking phase.

Variations & Substitutions

• Spice Swap: Add a pinch of nutmeg or cardamom to the crumble topping for added warmth and complexity.
• Nut Addition: Incorporate 1/2 cup of chopped pecans or walnuts into the crumble mixture for extra crunch.
• Different Berries: Substitute the raspberries with blackberries or strawberries for a slight flavor shift while keeping the rhubarb base.
• Gluten-Free Option: Use a gluten-free 1-to-1 flour blend for the crumble topping, and ensure your pie crust recipe accommodates gluten-free flour if necessary.

Serving Suggestions

This warm Rhubarb and Raspberry Crumble Pie is best served slightly warm or at room temperature. The classic accompaniment is a generous scoop of high-quality vanilla bean ice cream, which melts beautifully into the warm fruit and topping. Alternatively, serve it with a dollop of stabilized whipped cream or a drizzle of crème anglaise for a sophisticated finish.

Storage, Freezing & Reheating

• Storage: Store leftover pie covered tightly at room temperature for up to 1 day, or in the refrigerator for up to 3 days. Refrigeration may slightly soften the crumble topping.
• Freezing (Unbaked): You can assemble the entire pie (crust, filling, and topping) without baking. Wrap tightly in multiple layers of plastic wrap and then foil. Label and freeze for up to 3 months. Bake directly from frozen, adding 15-20 minutes to the initial baking time.
• Reheating: To revive the crispness, reheat individual slices in a toaster oven or conventional oven at 300 degrees F (150 degrees C) for 10-15 minutes until warmed through and the topping is crisp again. Avoid microwaving, as it makes the crust soggy.

Nutrition Information

Note: Nutritional values are estimates based on standard ingredient usage and portion size (1/8th of pie). Individual results may vary.

FAQ

Can I use only rhubarb or only raspberries?

Yes, you absolutely can. If using only rhubarb, you may need to increase the sugar slightly as rhubarb is quite tart. If using only raspberries, reduce the sugar in the filling slightly, as raspberries are naturally sweeter than rhubarb.

Do I need to thicken the filling if I use frozen fruit?

Yes, thickening is still necessary with frozen fruit. The flour or cornstarch is vital to absorb the excess liquid released by the fruit during baking, ensuring your pie sets up nicely rather than being runny.

How do I travel with this pie?

If you need to transport the pie, let it cool completely first. Place it in a box or container that keeps it steady. If it’s warm outside, transporting it in a cooler bag is recommended, though it tastes best when allowed to fully set at room temperature.

Rhubarb and Raspberry Crumble Pie

A delightful balance of tart rhubarb and sweet raspberries, topped with a buttery, crunchy oat crumble and baked into a flaky pie crust.

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Prep Time 45 minutes mins

Cook Time 55 minutes mins

Total Time 1 hour hr 40 minutes mins

Servings: 8 slices

Course: Dessert

Cuisine: American

Calories: 420

Ingredients Method Notes

Ingredients

  

For the Pie Crust (Use your favorite 9-inch double crust recipe or store-bought)

• 1 package Refrigerated pie crust Or homemade equivalent for a 9-inch pie

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For the Filling

• 3 cups Fresh or frozen rhubarb Chopped into 1-inch pieces
• 2 cups Fresh or frozen raspberries
• 3/4 cup Granulated sugar Adjust based on the tartness of the rhubarb
• 1/4 cup All-purpose flour For thickening
• 1 teaspoon Vanilla extract
• 1/4 teaspoon Ground cinnamon
• 1 tablespoon Lemon juice

For the Crumble Topping

• 1 cup All-purpose flour
• 3/4 cup Rolled oats Not instant
• 1/2 cup Packed light brown sugar
• 1/4 teaspoon Salt
• 1/2 cup Cold unsalted butter Cut into small cubes

Method

 

Instructions

1. Preheat your oven to 400°F (200°C). Lightly grease a 9-inch pie dish.
2. Prepare the pie crust: Line the pie dish with one crust; crimp the edges. Place the pie dish in the refrigerator while you prepare the filling and topping.
3. Make the filling: In a large bowl, gently combine the chopped rhubarb, raspberries, granulated sugar, flour, vanilla extract, cinnamon, and lemon juice. Toss until the fruit is evenly coated.
4. Make the crumble topping: In a separate medium bowl, whisk together the flour, rolled oats, brown sugar, and salt. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
5. Assemble the pie: Pour the fruit filling evenly into the chilled pie crust. Sprinkle the entire crumble topping mixture uniformly over the fruit.
6. Bake: Place the pie on a baking sheet (to catch drips). Bake at 400°F (200°C) for 20 minutes. Then, reduce the oven temperature to 375°F (190°C) and bake for an additional 30-35 minutes, or until the topping is golden brown and the filling is bubbling thickly.
7. Cool completely: Let the pie cool on a wire rack for at least 3 to 4 hours before slicing and serving. This allows the juices to set properly.

Notes

For extra crisp edges, cover the pie rim with aluminum foil for the first 30 minutes of baking. Serve warm with vanilla bean ice cream or fresh whipped cream.