Grapefruit Custard Tart Recipe

A buttery shortcrust pastry filled with silky citrus custard balances sweet and tangy notes, crowned with ruby-red grapefruit segments for a sophisticated dessert that refreshes the palate.
Difficulty:
Intermediate
Prep Time:
40 mins
Cook Time:
45 mins
Serves:
1 tart (8 slices)
An overhead shot of a perfectly crimped tart with a golden-brown shortcrust base, filled with a smooth, pale yellow custard that gleams under soft natural light. Vibrant pink and ruby-red grapefruit segments are artfully arranged in a concentric pattern on top, glistening with a light citrus glaze. A cross-section reveals the distinct layers – crisp pastry, creamy custard, and juicy grapefruit. The tart sits on a white ceramic stand against a light blue linen, with a few scattered grapefruit slices, fresh mint leaves, and a dusting of powdered sugar adding dimension. A vintage silver cake server rests nearby, ready to slice through the delicate creation.

Ingredients

<ul class="ingredients-main-list"><li class="ingredients-single-item">For the pastry:</li><li class="ingredients-single-item">200g plain flour</li><li class="ingredients-single-item">100g cold unsalted butter, cubed</li><li class="ingredients-single-item">30g icing sugar</li><li class="ingredients-single-item">1 large egg yolk</li><li class="ingredients-single-item">2-3 tbsp ice-cold water</li><li class="ingredients-single-item">¼ tsp salt</li><li class="ingredients-single-item">For the custard filling:</li><li class="ingredients-single-item">4 large eggs</li><li class="ingredients-single-item">150g caster sugar</li><li class="ingredients-single-item">Zest of 2 pink grapefruits</li><li class="ingredients-single-item">150ml freshly squeezed grapefruit juice (about 2 medium grapefruits)</li><li class="ingredients-single-item">150ml double cream</li><li class="ingredients-single-item">For the topping:</li><li class="ingredients-single-item">2 pink grapefruits, segmented</li><li class="ingredients-single-item">2 tbsp apricot jam</li><li class="ingredients-single-item">1 tbsp water</li></ul>

Equipment

<ul class="equipment-main-list"><li class="equipment-single-item">23cm fluted tart tin with removable base</li><li class="equipment-single-item">Baking beans or rice (for blind baking)</li><li class="equipment-single-item">Microplane or fine grater</li><li class="equipment-single-item">Citrus juicer</li><li class="equipment-single-item">Pastry brush</li></ul>
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Directions

<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>Start by making the shortcrust pastry. Place the flour, icing sugar and salt in a food processor and pulse briefly to combine. Add the cold cubed butter and pulse until the mixture resembles fine breadcrumbs (keeping the butter cold creates flaky layers in your pastry). Add the egg yolk and 2 tablespoons of ice-cold water, pulsing until the dough just comes together – add the extra tablespoon of water only if needed.</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>Turn the dough onto a lightly floured surface and gently shape into a disc without overworking (overworking develops gluten, making pastry tough). Wrap in cling film and refrigerate for at least 30 minutes – this relaxes the gluten and firms the butter, ensuring your pastry won't shrink during baking.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>Preheat your oven to 180°C (160°C fan). Roll the chilled pastry on a lightly floured surface to about 3mm thickness and a diameter large enough to line your tart tin. Carefully lift the pastry using your rolling pin and drape it over the tin. Gently press into the fluted edges, trimming any excess with a sharp knife. Prick the base several times with a fork.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>Line the pastry case with baking parchment and fill with baking beans or rice. Blind bake for 15 minutes, then remove the beans and parchment and bake for another 5-7 minutes until the base is dry and lightly golden. The bottom should feel sandy to the touch, not doughy. Remove from the oven and reduce the temperature to 160°C (140°C fan).</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>While the pastry cools slightly, make the custard filling. In a bowl, whisk together the eggs and caster sugar until pale and slightly thickened. Add the grapefruit zest and juice, whisking to combine. Gently stir in the double cream – the acid in the grapefruit will begin to thicken the cream, so work quickly but gently to maintain a smooth mixture.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>Place the tart shell on a baking tray (this makes it easier to transfer to the oven without spilling). Pour the custard mixture into the pastry case, filling it about 5mm from the top (the custard will puff slightly during baking). Carefully transfer to the oven and bake for 25-30 minutes until the filling is just set but still has a slight wobble in the center – like a good crème brûlée.</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>Allow the tart to cool completely at room temperature, then refrigerate for at least 2 hours or ideally overnight. This setting time allows the custard to firm up perfectly and the flavors to meld together beautifully.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>To prepare the grapefruit segments, slice off the top and bottom of each grapefruit, then with a sharp knife, follow the contour of the fruit to remove all peel and pith. Working over a bowl to catch the juices, carefully cut between the membranes to release clean segments.</li><li class="MethodStepper"><h4 class="step-title">Step 9</h4>Before serving, arrange the grapefruit segments decoratively on top of the custard. Heat the apricot jam with water in a small saucepan until melted and smooth. Using a pastry brush, gently glaze the grapefruit segments for a professional shine and to prevent them from drying out.</li><li class="MethodStepper"><h4 class="step-title">Step 10</h4>Carefully remove the tart from the tin by placing it on a can and gently easing the outer ring downward. Slide the tart onto a serving plate. For clean slices, dip a sharp knife in hot water and wipe dry between cuts. Serve chilled for the perfect balance of tangy grapefruit and creamy custard against crisp pastry.</li></ol>

Nutrition Facts (per serving)

🍽️ Serving Size: 1 slice
🔥 Calories: 385 calories
🥑 Fat: 22 g
🧈 Saturated Fat: 13 g
🍞 Carbohydrates: 38 g
🍭 Sugar: 24 g
🍗 Protein: 6 g
🫀 Cholesterol: 135 mg
🧂 Sodium: 180 mg

Chef’s Notes

A few helpful details for making this recipe.

Why does my citrus custard curdle when I add the grapefruit juice?

Curdling occurs when acid in grapefruit juice reacts with dairy. To prevent this, ensure all ingredients are at room temperature, add juice gradually while whisking constantly, and use double cream rather than milk. Whisking eggs with sugar first creates a buffer that helps stabilize the mixture.

Can I make this tart with other citrus fruits instead of grapefruit?

Absolutely! This tart works beautifully with oranges, blood oranges, lemons, or limes. Adjust sugar levels according to the fruit's natural sweetness—increase for lemons/limes, decrease for sweeter oranges. The technique remains the same, just adapt the flavour profile to your chosen citrus.

How do I prevent a soggy bottom on my custard tart?

Ensure a crisp base by thoroughly blind baking the pastry until golden. Cool the pastry case before adding filling, bake on a preheated baking sheet to conduct heat directly to the base, and avoid overfilling. Resting the filled tart overnight in the refrigerator helps the moisture equilibrate.

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