Introduction
This Blueberry Slab Pie is a showstopping dessert that’s perfect for feeding a crowd. You get all the nostalgic flavor of a classic blueberry pie but in a convenient, easy-to-serve rectangular form. The generous use of spices and a sprinkle of sugar on the flaky top crust makes every slice irresistible.
Prep & Cook Time
- Prep Time: 20 minutes
- Cook Time: 90 minutes
- Total Time: 110 minutes
- Servings: 20
Ingredients
- 8 cups wild blueberries
- 2 1/2 cups granulated sugar
- 1/4 cup lemon juice
- 3/4 cup instant tapioca
- 1/2 teaspoon ground cinnamon
- 3/4 teaspoon ground nutmeg
- pie crust (recipe for 2 double crust pies)
- granulated sugar (for dusting the top of the pie)
- egg wash
Instructions
- Preheat your oven to 375°F (190°C). Roll out one portion of the pie crust dough to line the bottom and sides of a 10×15-inch jelly roll pan or rimmed baking sheet.
- In a very large bowl, gently mix the wild blueberries, granulated sugar, lemon juice, instant tapioca, ground cinnamon, and ground nutmeg. Let the mixture sit for 15 minutes to allow the tapioca to begin absorbing the juices.
- Pour the blueberry filling into the crust-lined pan, spreading it into an even layer.
- Roll out the second portion of pie crust dough. Drape it over the filling. Trim any excess dough and crimp the edges to seal with the bottom crust.
- Brush the entire top crust generously with the egg wash. Use a sharp knife to cut a few decorative vents in the top crust to allow steam to escape.
- Sprinkle the top of the pie liberally with granulated sugar.
- Place the pan in the preheated oven. Bake for about 80-90 minutes, or until the crust is a deep golden brown and the filling is bubbling vigorously through the vents.
- Remove the pie from the oven and let it cool completely on a wire rack, for at least 4 hours, to allow the filling to set before slicing and serving.
Variations
- Lattice Top: Create a classic look by weaving a lattice crust instead of using a full sheet of dough for the top.
- Mini Slab Pies: Use smaller pans or a muffin tin with pie crust to make individual-sized slab pie portions.
- Drizzle or Glaze: Serve each slice with a drizzle of caramel sauce, a dollop of whipped cream, or a scoop of vanilla ice cream.
- Savory-Sweet Twist: Add a pinch of freshly cracked black pepper to the blueberry filling to create a subtle, sophisticated flavor contrast.
Tips for Success
- Let the blueberry filling sit with the tapioca as directed; this is crucial for preventing a runny pie.
- Ensure the pie is completely cool before cutting; this is the secret to clean slices and a properly set filling.
- If the edges of the crust begin to brown too quickly during baking, cover them with strips of aluminum foil.
- For the best flavor, use fresh lemon juice rather than bottled.
Storage & Reheating
Once cooled, cover the pie tightly with plastic wrap or store slices in an airtight container in the refrigerator for up to 4 days. To reheat a slice, warm it in a 300°F oven for 10-15 minutes until the crust is crisp again; avoid the microwave, which can make the crust soggy.
FAQ
Can I use frozen blueberries?
What can I substitute for instant tapioca?
The recipe is formulated for instant tapioca. Substituting with cornstarch or flour will change the texture and liquid ratio, so it is not recommended.
Why is my filling runny?
The most common reasons are not letting the tapioca absorb juices before baking, or slicing the pie before it has cooled completely. The filling sets as it cools.
Do I have to use wild blueberries?
You can use regular cultivated blueberries, but wild blueberries are smaller and often have a more concentrated, tangy flavor which is ideal for baking.
Can I make the pie crust ahead of time?
Absolutely. You can prepare the pie dough 2-3 days in advance and keep it wrapped in the refrigerator, or freeze it for up to 3 months.
How do I prevent a soggy bottom crust?
Ensure your oven is fully preheated before baking. Using a metal, rimmed baking sheet (not glass) also helps conduct heat effectively for a crispier bottom.