Rhubarb Custard Pie Recipe
A perfect harmony of tart rhubarb and creamy vanilla custard wrapped in buttery, flaky pastry that creates a comforting yet sophisticated dessert experience.
Ingredients
<ul class="ingredients-main-list"><li class="ingredients-single-item">For the pastry:</li><li class="ingredients-single-item">225g all-purpose flour</li><li class="ingredients-single-item">2 tbsp granulated sugar</li><li class="ingredients-single-item">1/4 tsp salt</li><li class="ingredients-single-item">115g cold unsalted butter, cubed</li><li class="ingredients-single-item">1 large egg, beaten</li><li class="ingredients-single-item">2-3 tbsp ice-cold water</li><li class="ingredients-single-item">For the filling:</li><li class="ingredients-single-item">500g fresh rhubarb, trimmed and cut into 2cm pieces</li><li class="ingredients-single-item">150g granulated sugar</li><li class="ingredients-single-item">3 tbsp cornstarch (cornflour)</li><li class="ingredients-single-item">1/4 tsp salt</li><li class="ingredients-single-item">3 large eggs</li><li class="ingredients-single-item">240ml double cream</li><li class="ingredients-single-item">1 tsp vanilla extract</li><li class="ingredients-single-item">1/4 tsp grated nutmeg</li><li class="ingredients-single-item">For the glaze:</li><li class="ingredients-single-item">1 egg, beaten with 1 tbsp milk</li><li class="ingredients-single-item">1 tbsp demerara sugar for sprinkling</li></ul>
Equipment
<ul class="equipment-main-list"><li class="equipment-single-item">23cm (9-inch) pie dish</li><li class="equipment-single-item">Food processor (optional)</li><li class="equipment-single-item">Rolling pin</li><li class="equipment-single-item">Pastry brush</li><li class="equipment-single-item">Pie weights or dried beans</li><li class="equipment-single-item">Baking sheet</li></ul>
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Directions
<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>First, make the pastry. In a large bowl or food processor, combine the flour, sugar, and salt. Add the cold cubed butter and pulse or use your fingertips to work it in until the mixture resembles coarse breadcrumbs with some pea-sized pieces remaining (these butter pockets will create flaky layers in your pastry).</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>Add the beaten egg and mix gently. Gradually add the ice water, 1 tablespoon at a time, until the dough just comes together when pinched. Be careful not to overwork the dough as this develops gluten and makes the pastry tough rather than tender.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>Divide the dough into two portions – about 2/3 for the base and 1/3 for the lattice top. Shape each portion into a flat disc, wrap in cling film, and refrigerate for at least 30 minutes. Chilling relaxes the gluten and firms up the butter, ensuring your pastry will be flaky when baked.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>Preheat your oven to 190°C (170°C fan/375°F). On a lightly floured surface, roll the larger disc of pastry to about 3mm thickness and a diameter large enough to line your pie dish with some overhang. Gently transfer the pastry to the dish, press it into the corners without stretching, and trim the edges leaving a 2cm overhang. Fold the overhang under itself and crimp decoratively.</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>Line the pastry case with baking parchment and fill with pie weights or dried beans. Blind bake for 15 minutes, then remove the weights and parchment and bake for another 5 minutes until the base is just starting to dry out but not brown. This pre-baking prevents the dreaded "soggy bottom" when adding wet fillings.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>While the base is baking, prepare the filling. In a large bowl, toss the rhubarb pieces with 75g of the sugar and let stand for 15 minutes. This draws out some moisture and starts to soften the rhubarb. Drain any excess liquid (you can reduce this for a sauce if desired).</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>In another bowl, whisk together the remaining 75g sugar, cornstarch, and salt. Add the eggs and whisk until smooth. Gradually whisk in the cream, vanilla extract, and nutmeg until well combined. The cornstarch is crucial here as it will thicken the custard as it bakes, allowing it to set properly around the rhubarb pieces.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>Arrange the drained rhubarb pieces evenly in the par-baked pastry case. Carefully pour the custard mixture over the rhubarb. Don't overfill – leave about 1cm from the top as the filling will expand slightly during baking.</li><li class="MethodStepper"><h4 class="step-title">Step 9</h4>Roll out the remaining pastry and cut into 2cm strips for a lattice top. Arrange the strips in a crisscross pattern over the filling, leaving gaps to allow steam to escape and to showcase the beautiful rhubarb and custard beneath. Trim the edges and press to seal with the base crust.</li><li class="MethodStepper"><h4 class="step-title">Step 10</h4>Brush the lattice with the egg and milk glaze, then sprinkle with demerara sugar for an extra crunch and golden color. The sugar will caramelize slightly, adding both texture and flavor.</li><li class="MethodStepper"><h4 class="step-title">Step 11</h4>Place the pie on a baking sheet (to catch any potential overflow) and bake for 20 minutes at 190°C, then reduce the temperature to 170°C (150°C fan/340°F) and bake for another 25-30 minutes until the pastry is golden and the filling is set but still has a slight wobble in the center, like a just-set custard.</li><li class="MethodStepper"><h4 class="step-title">Step 12</h4>Allow the pie to cool completely on a wire rack for at least 2 hours before slicing. This resting time is essential as it allows the custard to fully set. When you cut into it too soon, you'll have a runny filling rather than perfect, silky slices.</li><li class="MethodStepper"><h4 class="step-title">Step 13</h4>Serve at room temperature or slightly chilled. The pie is delicious on its own, but also pairs beautifully with a dollop of lightly whipped cream or a small scoop of vanilla ice cream. Leftovers should be refrigerated and consumed within 2-3 days.</li></ol>
Chef’s Notes
A few helpful details for making this recipe.
Why does my custard filling leak through the bottom crust?
Leaky custard typically means your crust wasn't properly blind baked. Always pre-bake your pastry for 15-20 minutes with weights, then 5 minutes without weights before adding the filling. This creates a barrier against moisture. Additionally, ensure your crust has no cracks and the egg-wash helps seal any potential weak spots.
Can I use frozen rhubarb instead of fresh in a custard pie?
Yes, frozen rhubarb works well but requires proper handling. Thaw completely, then drain thoroughly to remove excess moisture (save this flavourful liquid for syrup!). Pat dry with paper towels before using, and you may need to increase the cornstarch by 1-2 teaspoons to account for the additional moisture released during baking.
How do I know when my rhubarb custard pie is perfectly baked?
A perfectly baked custard pie should have golden-brown pastry and a filling that's just set with a slight wobble in the centre (like a just-set jelly). When gently shaken, the middle should move as one unit, not ripple like liquid. The internal temperature should reach about 75°C (165°F) for food safety.
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