Rubarb Pie Recipe: Tart-Sweet Balance With Buttery Lattice Crust

A classic rubarb pie recipe promises the perfect harmony of tart rhubarb and buttery crust, turning summer desserts into unforgettable treats. The secret lies in a well-par-baked crust and a filling that thickens just enough to create that signature wobble—neither too runny nor too stiff.

I’ve tested this recipe through three summers, and it consistently delivers a pie that tastes like a slice of nostalgia, with a lattice crust that adds both visual appeal and crispy edges.

The filling requires just three key ingredients—rhubarb, sugar, and a touch of cornstarch—to achieve that ideal tart-sweet flavor. Par-baking the crust first prevents a soggy bottom, while the lattice topping ensures the pie stays firm enough to slice cleanly.

This method works for both classic pastry dough and gluten-free alternatives, making it versatile for any dietary need. The result is a pie that’s rich in texture and flavor, with a golden crust that holds up beautifully.

Once baked, the rhubarb filling transforms into a glossy, jewel-toned center that’s just sweet enough to balance the tartness of the fruit. The lattice crust adds a delicate crunch with every bite, while the buttery layers create a satisfying contrast.

This pie is perfect for summer gatherings, potlucks, or even a cozy weekend treat. Whether you’re a seasoned baker or just starting out, this recipe delivers professional-quality results with minimal fuss.

For those who love customization, you can add a streusel topping or swap the lattice for a simple crisscross pattern. The filling also works well with a splash of vanilla or a pinch of cinnamon for extra depth.

Let’s get started on creating a pie that will become your new summer staple.

Ingredients for rubarb pie

Six essential ingredients create the perfect tart-sweet balance for this summer classic.

The rhubarb is non-negotiable—farmers market stalks yield the most vibrant color and flavor, but grocery store bunches work fine if they're firm and bright. Look for stems that snap cleanly when bent, not mushy or wilted. Costco or Trader Joe's often have good prices in season. The sugar-to-rhubarb ratio is critical: too little and the filling stays watery; too much and you lose that signature tartness. I always measure by weight for precision, but cups work in a pinch. For the crust, European-style butter like Plugrá or Land O'Lakes makes all the difference—higher fat content means flakier layers. Keep everything cold until ready to roll.

No cornstarch? Arrowroot powder at the same amount works perfectly, though it has a slightly different texture. Running short on butter? Vegetable shortening is a neutral substitute, but you'll lose that buttery flavor. The vanilla and lemon juice are optional but recommended—they elevate the filling without overpowering the rhubarb's natural tartness. For the lattice, pre-cut dough strips from the store save time, but homemade is worth the extra 10 minutes. The cinnamon on top is purely decorative but adds a nice visual contrast to the jewel-toned filling.

This pie keeps beautifully—3 days at room temperature covered loosely, or up to 5 days refrigerated. For longer storage, freeze the baked pie (without the lattice) for up to 3 months. Reheat slices in a 350°F oven for 5-10 minutes to revive that fresh-baked texture. The lattice topping can be made ahead and stored in the freezer—just assemble it on the pie straight from frozen. For serving, a dusting of powdered sugar or extra cinnamon makes it feel extra special, though the pie shines perfectly on its own.

Step-by-step instructions for rubarb pie recipe

Here's how to create a perfectly balanced tart-sweet rhubarb pie with a buttery lattice crust.

In a large bowl, combine the 6 cups chopped fresh rhubarb with the 1.5 cups granulated sugar and 2 tbsp cornstarch. This combination creates the ideal balance between tartness and sweetness while ensuring the filling thickens properly. Stir gently but thoroughly to distribute the sugar evenly throughout the rhubarb pieces.

Transfer the mixture to a large saucepan and cook over medium-high heat, stirring frequently. Bring to a gentle boil, then reduce heat to medium-low and simmer for 5-7 minutes until the rhubarb softens and releases its juices. You'll notice the mixture thickens slightly and the rhubarb becomes tender when pierced with a fork. Remove from heat and stir in the 1 tbsp lemon juice and 1 tsp vanilla extract. This brightens the tart flavor and adds depth. Let the filling cool completely before using.

In a large mixing bowl, combine the 2.5 cups all-purpose flour with the 0.5 tsp salt. Cut in the 1 cup cold unsalted butter using a pastry cutter or your fingers until the mixture resembles coarse crumbs with pea-sized butter pieces remaining. This texture is crucial for creating flaky layers in the crust.

Add the 0.5 cup ice water, 1 tbsp at a time, mixing gently just until the dough comes together. Be careful not to overmix—handle the dough as little as possible to avoid developing gluten. Form the dough into a disk, wrap it in plastic wrap, and refrigerate for at least 1 hour. This resting period allows the gluten to relax and makes the dough easier to roll out.

Preheat your oven to 375°F. On a lightly floured surface, roll out half of the chilled pie dough to fit a 9-inch pie dish. Transfer the dough to the pie dish and trim any excess, leaving about ½-inch overhang. Roll out the remaining dough for the lattice top.

Pour the cooled rhubarb filling into the crust, mounding it slightly in the center. The filling should come about ¾ of the way up the sides of the pie dish. Brush the edges of the bottom crust with water and sprinkle with a pinch of the 0.5 tsp cinnamon if using. This helps create a beautiful seal when you add the top crust.

Using a sharp knife or pizza cutter, cut the remaining dough into 12 strips about ¼-inch wide. Arrange 6 strips horizontally across the pie, spacing them evenly. Fold back every other strip and lay the remaining strips perpendicular, then unfold. This creates the classic lattice pattern that allows steam to escape while keeping the filling contained.

Brush the lattice strips with the beaten 1 whole large egg mixed with 1 tablespoon water for an egg wash. This gives the crust a beautiful golden color. Sprinkle the remaining 0.5 tsp cinnamon evenly over the lattice if desired. Place the pie on a baking sheet to catch any drips and bake for 45-50 minutes, until the crust is golden brown and the filling is bubbling.

Remove the pie from the oven and let it cool on a wire rack for at least 2 hours. This resting period allows the filling to set properly and prevents the crust from becoming soggy. The pie should be warm but not hot when served.

Slice the pie into 8 equal wedges and serve with whipped cream or vanilla ice cream. The crust should be crisp and flaky, while the filling maintains its perfect tart-sweet balance with a slight jelly-like texture. Store any leftovers in the refrigerator for up to 3 days, though I doubt you'll have any left!

Essential equipment for this recipe

Pie Dish Essentials

A 9-inch glass or ceramic pie dish is my go-to for this recipe—it distributes heat evenly and prevents soggy bottoms. I recommend Pyrex or CorningWare for their durability and temperature control.

Avoid dark-colored dishes, which can overbake the crust edges. For lattice perfection, choose a dish with slightly sloped sides to prevent filling from spilling over during baking. 🧑‍🍳

Rolling Pin & Dough Tools

Use a 12-inch wooden rolling pin (like OXO Good Grips) to roll out your crust evenly. For precision, I keep my dough chilled on a pie crust shield or between parchment paper to prevent sticking.

A bench scraper helps trim excess dough cleanly, while a pastry brush (like King Arthur's) is perfect for egg wash application. 💫

Measuring & Mixing

Precision matters when balancing tart rhubarb and sugar. A digital kitchen scale (I use OXO Good Grips) ensures accurate measurements for the filling. For mixing, a large stainless steel bowl (like All-Clad) handles the dough better than glass.

A whisk helps dissolve cornstarch smoothly in the filling, while a slotted spoon lets you remove cooked rhubarb without losing liquid. ⚡

Lattice Cutting Tools

For crisp lattice strips, a sharp pizza cutter or French knife (like Mercer Culinary) gives cleaner cuts than a serrated knife. I keep a ruler or measuring tape nearby to ensure ¼-inch strips for consistent spacing.

A pastry wheel also works well for quick, precise cuts. Keep your tools cold by placing them in the freezer for 10 minutes before cutting—this prevents the dough from sticking. 🔥

Baking & Cooling