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Sharp, silky, perfectly balanced. Looks like it came from a proper patisserie. Your secret? It's honestly not that hard.
Make the pastry: rub the Cold unsalted butter into the Plain flour and Icing sugar with your fingertips until the mixture looks like fine breadcrumbs.
Add the Egg yolks (for pastry) and just enough Cold water to bring the dough together — it should not be sticky. Shape into a disc, wrap, and rest in the fridge for 30 minutes.
Roll the pastry out on a lightly floured surface to about 3 mm thick and line a 23 cm loose-bottomed tart tin. Press it firmly into the edges and trim any overhang. Prick the base with a fork and chill for another 20 minutes.
Line the pastry case with baking paper and fill with baking beans (or dried rice or lentils). Blind bake (pre-cook an empty pastry case before filling) at 180°C / 350°F for 15 minutes, then remove the paper and beans and bake for another 10 minutes until pale golden.
Whisk together the Whole eggs (for filling), Egg yolks (for filling), Caster sugar, Fresh lemon juice, Lemon zest, and Double cream in a bowl until smooth.
Reduce the oven to 140°C / 285°F. Pour the lemon filling into the hot pastry case — fill it while the case is still in the oven to avoid spills.
Bake for 30–35 minutes until the filling is just set with a gentle wobble in the centre. It will firm up as it cools.
Cool completely at room temperature before refrigerating. Slice only when fully cold — a warm tart will not cut cleanly.