Name: Summer Triple Berry Slab Pie Recipe
Prep time: 25 min
Cook time: 45 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 310 g (2½ cups) all-purpose flour; 230 g (2 cups) spelt flour; 1 tsp Kosher salt; 227 g (1 cup) unsalted butter, very cold, cubed; 170 g (14 Tbsp) vegetable shortening, very cold, cubed; 10 Tbsp ice water; 7 cups fresh mixed berries (blueberries, raspberries, and strawberries, hulled and quartered); 100 g (½ cup) granulated sugar; 35 g (¼ cup) all-purpose flour; 1 medium lemon, juiced (about 1 Tbsp) and zested (about 2 tsp); ¼ tsp Kosher salt; 1 large egg, lightly beaten; 2-3 Tbsp turbinado sugar; Ice cream or whipped cream, for serving

Jump to Recipe· 4.2 from 4 reviews

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There is nothing quite like a vibrant, bursting-with-flavor slice of the Summer Triple Berry Slab Pie Recipe to brighten any gathering or family meal. This pie brings together the sweet and tangy magic of fresh blueberries, raspberries, and strawberries nestled in a perfectly flaky, tender crust made from a blend of all-purpose and spelt flour. What makes this recipe truly shine is its generous size and simple yet thoughtful preparation, making it ideal for sharing with a crowd while celebrating summer’s bounty in the most delicious way possible. Get ready to impress your friends with a dessert that tastes like sunshine on a plate!

Ingredients You’ll Need

This image shows several baking ingredients arranged on a white marbled surface. In the center is a white bowl filled with light brown flour with some texture. To the left of the bowl, there is a stick of butter wrapped in paper with blue text, and below it are a small white bowl with white sugar and another small white bowl with salt. Above the sugar is a small white bowl with melted butter. Next to the melted butter, there is a single white egg standing upright. To the right of the flour bowl, a small dark measuring cup holds brown sugar. At the bottom right corner, a white bowl contains a mix of red strawberries, raspberries, and dark blueberries. Also visible on the right side is a clear glass with ice water. Photo taken with an iphone --ar 4:5 --v 7

Gathering these simple yet essential ingredients will ensure your Summer Triple Berry Slab Pie Recipe shines in both flavor and texture. Each element plays a crucial role, from the flaky crust to the luscious berry filling and the sweet finishing touches.

All-purpose flour (310 g / 2½ cups): The foundation of your flaky, tender pie crust.
Spelt flour (230 g / 2 cups): Adds a subtle nuttiness and extra texture to the dough.
Kosher salt (1 tsp + ¼ tsp): Enhances all the flavors, inside and out.
Unsalted butter (227 g / 1 cup, very cold, cubed): Creates those flaky layers everyone loves in pie crust.
Vegetable shortening (170 g / 14 Tbsp, very cold, cubed): Helps achieve a tender, crumbly finish to the crust.
Ice water (10 Tbsp): Brings the dough together without warming the fats.
Fresh mixed berries (7 cups): Blueberries, raspberries, and strawberries for that ultimate summer burst of color and flavor.
Granulated sugar (100 g / ½ cup): Sweetens the berries just enough without overpowering them.
All-purpose flour (35 g / ¼ cup): Helps thicken the juicy berry filling.
Lemon juice and zest (from 1 medium lemon): Adds bright, fresh zing to balance the sweetness.
Large egg (1, lightly beaten): For brushing and giving the crust that golden, shiny finish.
Turbinado sugar (2–3 Tbsp): Sprinkled on top for a perfect crunchy, sparkling crust.
Ice cream or whipped cream (for serving): The perfect creamy partner to warm, fruity pie slices.

How to Make Summer Triple Berry Slab Pie Recipe

Step 1: Crafting the Perfect Pie Dough

Start by combining your all-purpose and spelt flours with kosher salt in a food processor – this mix is the base of your crust’s unique texture and taste. Next, add in your cold, cubed butter and shortening. The key here is to pulse just until pea-sized pieces remain, ensuring your crust will be flaky and tender after baking.

Step 2: Bringing the Dough Together with Ice Water

Slowly add ice water, starting with 6 tablespoons, pulsing until the dough begins to cling together. Add additional tablespoon by tablespoon only as needed, typically stopping around 8 tablespoons to keep the dough perfectly moist but not sticky.

Step 3: Chilling Your Dough Disks

Once the dough forms, divide it into two equal disks. Wrapping them tightly in plastic is crucial to retain moisture and prevent drying out. Refrigerate for at least 30 minutes to relax the gluten and firm up the fats, making rolling out easier later.

Step 4: Preparing the Burst of Berry Goodness

While the dough chills, preheat your oven to 375°F (190°C). Gently toss together your fresh mixed berries with sugar, flour, lemon juice, zest, and a pinch of salt in a large bowl. This step ensures every bite of filling is balanced with sweetness and a touch of tartness, perfect for that iconic triple berry flavor.

Step 5: Rolling Out the Bottom Crust

On a lightly floured surface, roll out one disk of dough to roughly 17 x 12 inches so it comfortably drapes over your 15 x 10-inch sheet pan with a bit hanging over the edges. Transfer carefully and press the dough into the bottom and up the sides of the pan. Don’t fret about little tears—the dough is forgiving and can be gently patched with your fingers. Chill again until you’re ready to assemble.

Step 6: Adding the Juicy Berry Filling

Pour your beautifully mixed berries into the crust, spreading them into an even layer. This is where your pie starts turning into the gorgeous, inviting dessert everyone will be talking about.

Step 7: Rolling Out the Top Crust and Optional Lattice

Roll out the second dough disk. For a classic fully covered pie, carefully place this sheet over your berries, sealing the edges. Or, for a stunning presentation with extra crunch and ventilation, cut the dough into long strips and weave them diagonally across the berries to create a lattice.

Step 8: Crimping and Decorating the Edges

Trim any excess dough so the top and bottom crust edges align neatly. Fold the bottom dough edge over the top crust and crimp it with fingers or a fork for that beautiful homemade look and to seal in all the delicious juices.

Step 9: Brushing and Sugaring Before Baking

Brush the entire top crust with lightly beaten egg, then sprinkle evenly with turbinado sugar. This will give your pie a golden, sparkly finish that’s as delightful to look at as it is to eat.

Step 10: Baking to Perfection

Bake the slab pie for 40 to 45 minutes, until the crust is a deep golden brown and you see the berries bubbling happily within. Let it cool for at least an hour before slicing to allow the filling to set perfectly. Serve with your favorite ice cream or whipped cream for the ultimate summer treat.

How to Serve Summer Triple Berry Slab Pie Recipe

A rectangular pie with a golden brown lattice crust on top, showing a deep red and dark purple fruit filling underneath. The lattice strips are thick and woven in a crisscross pattern with a slightly rough texture and some sugar crystals sprinkled over them. Scattered on the pie and filling are small, fresh blueberries adding dark blue spots on the surface. The pie is inside a metal pan with edges crimped neatly. Around the pan, on a white marbled surface, there is a small white bowl filled with fresh blueberries and a woman's hand resting near the bottom left corner of the frame. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

Adding a scoop of vanilla ice cream or a dollop of fresh whipped cream instantly elevates this pie, bringing in a creamy contrast to the tartness of the berries. If you want to get fancy, sprinkle some fresh mint leaves or a light dusting of powdered sugar for a beautiful presentation.

Side Dishes

This pie pairs wonderfully with simple sides like a crisp green salad or light cucumber sandwiches at your summer gathering, letting the pie stand out as the star of the show while keeping the menu refreshing and balanced.

Creative Ways to Present

Go beyond the classic slice by serving your Summer Triple Berry Slab Pie Recipe in rustic wedges on wooden boards for a casual picnic vibe, or place individual slices on pretty dessert plates garnished with extra fresh berries and a drizzle of berry coulis to take the experience up a notch.

Make Ahead and Storage

Storing Leftovers

Cover any leftover pie tightly with plastic wrap or aluminum foil and store it in the refrigerator. It will stay fresh and delicious for up to 3 days, making it a perfect treat to enjoy well after your summer party ends.

Freezing

You can freeze baked pie slices individually wrapped in plastic and foil for up to 2 months. For best results, thaw overnight in the fridge and reheat gently to enjoy the fresh-baked taste.

Reheating

Reheat slices in a warm oven at 325°F (160°C) for 10–15 minutes, or until warmed through. Avoid microwaving if possible, as it can make the crust soggy and less delightful.

FAQs

Can I substitute other berries in the Summer Triple Berry Slab Pie Recipe?

Absolutely! While blueberries, raspberries, and strawberries are traditional, feel free to experiment with blackberries, cherries, or even frozen berries if fresh aren’t available. Just be mindful of moisture differences.

Is spelt flour necessary for the crust?

Spelt flour adds a lovely nutty flavor and a slightly different texture to the crust, but you can replace it entirely with all-purpose flour if needed. The crust will still be delicious, just a bit less rustic.

Can I make the pie dough by hand instead of a food processor?

Definitely! Use cold butter and shortening, and cut them into the flour mixture with a pastry cutter or two knives until you see pea-sized pieces. Then incorporate cold water gradually until the dough comes together.

How do I prevent the pie crust from getting soggy?

Using flour in the berry filling helps thicken the juices, and chilling the dough before baking sets the fats to create a barrier. Baking until the crust is golden brown also helps keep it crisp.

Can I prepare this pie in advance for a party?

You can assemble the pie a day before and refrigerate it unbaked. Just bring it to room temperature before baking. This saves time and lets you enjoy your guests more!

Final Thoughts

Trying out this Summer Triple Berry Slab Pie Recipe is like inviting a little sunshine into your kitchen. Its wholesome crust and juicy, perfectly balanced berry filling make it a guaranteed crowd-pleaser. Whether you’re baking for friends, family, or just yourself, this pie is a joyful way to celebrate summer’s sweetest flavors. I hope it becomes one of your cherished go-to recipes like it is for me!

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