
Master the dessert-shop look at home with a straightforward method that breaks the tart into three easy, make-ahead components. Along the way you’ll pick up pro tips on blind-baking, stabilizing pastry cream, and achieving that photo-ready glossy finish without specialized tools.
All-purpose flour, 1 ¼ cups (160 g)
Prepare the tart dough by mixing the flour, 3 tbsp sugar, and salt in a bowl, then cut in the cold cubed butter until the mixture resembles coarse crumbs; add the egg yolk and 1–2 tbsp ice-cold water just until the dough comes together, form into a disk, wrap, and chill for at least 30 minutes.
Roll the dough on a lightly floured surface to about ⅛ inch (3 mm) thick, fit it into a 9-inch tart pan with a removable bottom, trim the excess, prick the base with a fork, and chill the shell again for 15–20 minutes to prevent shrinking.
Blind-bake the shell at 375°F (190°C) by lining it with parchment and filling with pie weights or dried beans; bake for about 15 minutes, remove the weights and parchment, then bake another 8–10 minutes until lightly golden; let it cool completely.
Make the vanilla custard by heating the milk, heavy cream, and vanilla (bean + seeds or extract) in a saucepan until just simmering; in a bowl whisk the egg yolks, ⅓ cup sugar, cornstarch, and a pinch of salt until smooth.
Slowly pour the hot milk mixture into the egg mixture while whisking constantly (tempering), then return everything to the saucepan and cook over medium heat, whisking, until thick and smooth (about 2–3 minutes); remove from heat and stir in 1 tbsp butter.
Transfer the custard to a bowl, press plastic wrap directly onto the surface to prevent a skin, and chill until fully cold and set (at least 1 hour).
Prepare the glaze by warming the apricot jam with 1 tbsp water and lemon juice until smooth, then strain if needed and keep slightly warm.
Assemble the tart by whisking the chilled custard briefly until smooth, spreading it evenly into the cooled tart shell, then arranging the strawberries, raspberries, blueberries, and blackberries on top in a decorative pattern.
Lightly brush the berries with the warm glaze for shine and preservation, optionally dust the edges with powdered sugar and garnish with fresh mint before serving.
While the crust is still warm, brush a thin layer of melted white chocolate over the base; it sets quickly and creates a moisture barrier that keeps the shell crisp for 24 hours. For a flavor twist, fold a teaspoon of finely grated lemon zest into the cooled pastry cream before filling—the subtle citrus lifts the berries without competing with their sweetness.