
A classic summer treat featuring a buttery, crisp shortbread base topped with a silky vanilla custard and fresh, glazed strawberries. This elegant dessert is perfect for afternoon tea or a sunny garden party.
Preheat your oven to 200°C (180°C fan/gas 6). Line a 20cm square baking tin with parchment paper, ensuring the paper overhangs the sides for easy removal later.
Prepare the base by beating the unsalted butter and golden caster sugar together with an electric whisk until the mixture is light and fluffy. Sift in the plain flour and cornflour, then stir until a soft dough forms.
Press the dough firmly and evenly into the prepared tin. Prick the surface all over with a fork and bake for 15-20 minutes until the shortbread is set and lightly golden. Allow it to cool completely in the tin.
For the custard filling, soak the gelatine sheet in a bowl of cold water. In a saucepan over low heat, warm the double cream and vanilla bean paste until it just begins to steam.
In a separate heatproof bowl, whisk the egg yolks, remaining sugar, cornflour, and plain flour into a thick paste. Slowly pour the warm cream into the egg mixture, whisking constantly to prevent curdling.
Return the mixture to the saucepan over medium-low heat. Bring to a gentle boil while whisking continuously for 4-5 minutes until the custard is very thick and bubbling. Remove from the heat.
Squeeze the excess water from the soaked gelatine and stir it into the hot custard until fully dissolved. Pour the custard over the cooled shortbread base, smooth the surface, and refrigerate for at least 3 hours until firmly set.
Once set, arrange the sliced strawberries in overlapping lines across the top. Brush with warmed and sieved strawberry jam for a professional, glossy finish. Slice into 9 or 12 squares to serve.
For the cleanest edges, use a sharp knife dipped in hot water and wiped dry between each cut. This slice is best served on the day of assembly to ensure the shortbread base remains perfectly crisp.