5-Step Best Raspberry-Rhubarb Slab Pie Recipe (Flaky & Fruity) | July 9, 2025

Best Raspberry Rhubarb Slab Pie Recipe is a flaky, fruity dessert that combines…If you’ve been craving a flaky, fruity dessert, this best raspberry-rhubarb slab pie recipe is a must-try for your kitchen. Combining the tartness of fresh rhubarb with the sweet pop of raspberries inside a golden, buttery crust, this slab pie is perfect for feeding a crowd during summer gatherings, potlucks, or cozy family weekends.

Ingredients

For the Crust:

• 2 ½ cups all-purpose flour

• 1 tsp salt

• 1 tsp granulated sugar

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• 1 cup (2 sticks) unsalted butter, cold and cubed

• 6–8 tbsp ice water

For the Filling:

• 3 cups rhubarb, chopped

• 2 cups fresh raspberries

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• 1 cup granulated sugar

• ¼ cup cornstarch

• 1 tbsp lemon juice

• 1 tsp vanilla extract

For Assembly:

• 1 egg (for egg wash)

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• 1 tbsp coarse sugar (optional, for topping)

Directions

 

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