Description
Frozen blackberries create a jammy base topped with a buttery oat and flour crumble for contrasting crunch and warmth. Lemon juice enhances the berries' natural tartness without overpowering. Ideal for casual gatherings with its forgiving assembly and golden topping; prepare in disposable aluminum pan, freeze unbaked, and bake directly from frozen when ready. Approximate cook time 55-70 minutes.
Cultural Background
Crumble toppings originated in Britain during World War II as a simple, flour-based alternative to scarce pastry ingredients for fruit desserts. Blackberry pies draw from both British foraging traditions and American summer baking customs, where wild or frozen berries fill pies and crumbles alike. Marzipan, an almond paste with roots in medieval European confectionery especially popular in German and Scandinavian baking, adds a rich, nutty layer of heritage when grated into the topping for subtle sweetness and texture.
Recipe Info
PREP TIME: 25 minutes
COOK TIME: 55-70 minutes
TOTAL TIME: 6-7 hours (including freezing and baking from frozen)
SERVINGS: 8
DIFFICULTY: Easy
Ingredients
- 1 9-inch unbaked pie crust (homemade or store-bought)
- 6 cups frozen blackberries (do not thaw)
- 1 cup granulated sugar
- 1/3 cup cornstarch
- 1 tablespoon fresh lemon juice
- 1/4 teaspoon salt
- 1 cup all-purpose flour
- 1/2 cup old-fashioned oats
- 1/2 cup unsalted butter (cold, cubed)
- 1/2 cup light brown sugar
- 4 ounces marzipan (grated)
- 1 disposable 9-inch aluminum pie pan
Instructions
- Fit the pie crust into the disposable aluminum pan and crimp the edges; place in the refrigerator while preparing the filling.
- In a large bowl, gently toss the frozen blackberries with the granulated sugar, cornstarch, lemon juice, and salt until evenly coated; let sit 5 minutes to begin releasing juices.
- In a separate bowl, combine the flour, oats, brown sugar, and grated marzipan; add the cold cubed butter and use a pastry cutter or fingers to work it in until the mixture forms coarse crumbs with some larger pieces for texture.
- Spoon the blackberry mixture into the prepared crust, spreading evenly; sprinkle the crumble topping generously over the filling, covering completely.
- For make-ahead freezing: Place the assembled unbaked pie (in the aluminum pan) on a flat surface in the freezer until solid, about 2-3 hours; once frozen, wrap tightly in plastic wrap followed by aluminum foil, label with date, and store in the freezer for up to 3 months.
- To bake from frozen: Preheat oven to 400°F; unwrap the frozen pie and place on a rimmed baking sheet to catch any drips; bake for 55-70 minutes until the crumble is deep golden brown, the filling is bubbling thickly around the edges, and the internal temperature of the filling reaches at least 200°F (use a foil shield on the crust edges if browning too quickly).
- Remove from oven and cool on a wire rack for at least 2 hours before slicing to allow the filling to set.
Tips
- Grate the marzipan while cold for easier incorporation into the crumble and even distribution of almond flavor.
- Avoid overmixing the crumble to keep it rustic and chunky rather than sandy.
- Substitute the marzipan with an equal amount of almond flour mixed with a teaspoon of almond extract if marzipan is unavailable.
Nutrition
Calories: 480
Protein: 5g
Carbs: 72g
Fat: 20g