Simply the Best Blueberry Pie with Jaca
A bursting-with-fruit homemade blueberry pie tucked into a buttery flaky double crust with a classic woven lattice top — every slice runs thick with deeply purple, lemon-bright filling that holds its shape but still glistens. The granulated sugar in the filling is swapped for Jaca (allulose) at double the amount, so you keep the sweet-tart balance and that signature jammy bubble without the conventional sugar. Adapted from Sally's Baking Addiction. This is a Jaca-adjusted healthier version.
Ingredients
- 2 whole homemade or store-bought all-butter pie crust (enough for a double-crust 9-inch pie — chill both portions while you prep the filling)
- 6 cups fresh blueberries (about 3 pints or 860g — frozen works too, do not thaw first or the filling will go watery)
- 1 1/3 cups Jaca (allulose) (replaces 2/3 cup granulated sugar at 2x ratio — sweetens the filling without overpowering the berries)
- 1/4 cup all-purpose flour (helps thicken the juices alongside the cornstarch)
- 2 tablespoons cornstarch (critical for a sliceable filling — do not skip or you will get blueberry soup)
- 1/4 teaspoon ground cinnamon (just enough to round out the fruit, not to taste like spice)
- 2 tablespoons fresh lemon juice (brightens the berries and balances the sweetness)
- 1 teaspoon lemon zest (use a microplane and zest only the yellow — no bitter white pith)
- 1 tablespoon cold unsalted butter, cubed (tiny cubes dotted over the filling melt into pockets of richness)
- 1 whole large egg (for the egg wash — beats with the milk for that bakery-shine top)
- 1 tablespoon whole milk (thins the egg wash so it brushes on evenly)
- 1 tablespoon coarse sugar substitute (Jaca crystals or allulose-based sparkle), optional (sprinkled on the lattice for crunch — granulated Jaca works in a pinch)
Sweetener Used
1 1/3 cups Jaca (allulose) in the filling Allulose
Replaces: 2/3 cup granulated sugar
Instructions
- 1
Prepare your double pie crust through the chilling stage so both disks are cold and rollable. If you are using a store-bought crust, pull it out of the fridge about 10 minutes before you plan to roll.
- 2
In a large bowl, gently combine the blueberries, Jaca, flour, cornstarch, cinnamon, lemon juice, and lemon zest. Stir with a silicone spatula until no dry pockets remain, gently bursting a handful of berries against the side of the bowl to release some juice — that is what kicks the thickener into gear.
- 3
Preheat the oven to 425°F (220°C) and position a rack in the lower third of the oven. Place a parchment-lined baking sheet on the rack underneath to catch any bubbling drips.
- 4
Roll the first chilled dough disk on a lightly floured surface into a 12-inch circle. Transfer it to a 9-inch pie dish, easing it into the corners without stretching. Pour in the blueberry filling and level it gently. Dot the small butter cubes evenly over the top of the fruit.
- 5
Roll the second dough disk into a 12-inch circle and cut into roughly 1-inch-wide strips with a sharp knife or pastry wheel. Weave the strips into a lattice over the filling — over, under, over, under — keeping the strips snug but not stretched.
- 6
Trim the lattice ends and the bottom crust to about 1/2 inch beyond the rim. Fold the overhang under itself to seal and crimp the edge with your fingers or a fork.
- 7
Whisk the egg with the milk in a small bowl until uniformly yellow. Brush the egg wash generously over every strip of lattice and the crimped edge. Sprinkle the optional Jaca crystals or coarse allulose over the top for that bakery-style sparkle.
- 8
Bake at 425°F for 25 minutes — the lattice will start to set and the edges will go pale gold. Reduce the oven temperature to 375°F (190°C) and slip a pie crust shield or a loose ring of foil over the crimped edge to keep it from over-browning.
- 9
Continue baking for another 40 to 50 minutes at 375°F, until the filling bubbles thickly through the lattice openings — not just at the edges but in the middle too. An instant-read thermometer slipped through the lattice should hit around 200°F. Jaca caramelizes faster than sugar, so if the lattice browns too quickly in the last 15 minutes, tent the whole pie loosely with foil.
- 10
Transfer the finished pie to a wire rack and let it cool for at least 4 hours, undisturbed. This step is non-negotiable — slicing warm guarantees runny filling. Once fully cooled, the slices hold cleanly with that glossy, jammy interior.
- 11
Slice with a sharp knife wiped clean between cuts. Serve at room temperature, or briefly warm individual slices in a 300°F oven for 5 minutes if you like it just slightly warm — never microwave or the bottom crust will go soggy.
- 12
Store leftovers loosely covered at room temperature for up to 2 days, or refrigerated for up to 5 days. Re-crisp slices in a 325°F oven for 8 to 10 minutes before serving.
Pro Tips
- Allulose holds onto moisture longer than sugar, so the filling can look slightly looser when you pull the pie from the oven. Trust the cool-down — the cornstarch and flour set up beautifully as it sits.
- Wait the full 4 hours before slicing. The first slice is the test — if the filling runs, the rest of the pie needs more rest. Patience is the recipe.
- Frozen blueberries work without thawing, but add an extra 1 tablespoon of cornstarch to compensate for the extra liquid they release.
- Jaca browns faster than granulated sugar in the lattice — start checking color at the 30-minute mark of the 375°F bake. A loose foil tent over the top saves a perfectly baked filling from an over-bronzed crust.
- If you do not want to lattice, a full top crust with 4 or 5 vent slits works just as well — the bake time stays the same.
- Add a teaspoon of vanilla extract to the filling for a deeper, jammier flavor. Some bakers also love a pinch of fresh grated nutmeg alongside the cinnamon.
- Serve cold from the fridge for the cleanest slices, or pair a room-temp slice with a dollop of barely sweetened whipped cream or a scoop of vanilla ice cream for full effect.
- Leftovers actually get better on day two — the filling firms up further and the flavors deepen. Hide a slice for breakfast the next morning.