📖 Instructions

1. **For the Tart Crust (Pâte Sablée):** In a large bowl, whisk together the all-purpose flour, granulated sugar, and salt. Make sure it's all nicely combined, no lumps allowed!
2. Add the cold unsalted butter, cut into small cubes. Using your fingertips or a pastry blender, work the butter into the flour mixture until it resembles coarse crumbs with some pea-sized pieces of butter remaining. The colder the butter, the flakier your crust will be. Don't be shy about getting your hands in there, but work quickly so the butter doesn't get too warm.
3. Pour in the ice-cold water, one tablespoon at a time, mixing until the dough just comes together. Be careful not to add too much water; you want it to be shaggy but able to hold together when squeezed. Overmixing or too much water will make your crust tough. Once it barely comes together, stop.
4. Gather the dough into a disc, wrap it tightly in plastic wrap, and refrigerate for at least 30 minutes, or even better, an hour. This chilling step is super important, it lets the gluten relax and prevents your crust from shrinking when baked.
5. Lightly flour a clean surface and your rolling pin. Roll out the chilled dough into a 12-inch circle, about 1/8-inch thick. Gently transfer the dough to a 9-inch tart pan with a removable bottom. Press the dough into the bottom and up the sides of the pan. Trim any excess dough from the edges using a sharp knife or by rolling your pin over the top of the tart pan.
6. Prick the bottom of the tart shell all over with a fork. This helps steam escape and prevents bubbles. Now, pop the tart shell back into the fridge or freezer for another 15-20 minutes. Again, chilling is your friend here!
7. Preheat your oven to 375°F (190°C). Line the chilled tart shell with parchment paper or aluminum foil, making sure it extends over the edges. Fill the lined shell with pie weights, dried beans, or rice, distributing them evenly up the sides. This is called blind baking, and it keeps the crust from puffing up.
8. Bake for 15-20 minutes, or until the edges are lightly golden. Carefully remove the parchment paper and weights. Return the crust to the oven and bake for another 5-10 minutes, or until the bottom is lightly golden brown and dry. This step ensures a crispy base. Let it cool completely on a wire rack while you prepare the custard.
9. **For the Lemon Custard Filling:** In a medium, heavy-bottomed saucepan, whisk together the granulated sugar and lemon zest. Rub the zest into the sugar with your fingers for a minute or two – this really helps to release those beautiful lemon oils and infuses the sugar with intense flavor. Don't skip this; it's a game-changer!
10. Whisk in the fresh lemon juice, whole eggs, and egg yolks until well combined. Make sure there are no streaks of egg white left. Slowly whisk in the heavy cream. Once everything is incorporated, place the saucepan over medium-low heat.
11. Cook the custard, whisking constantly, until it thickens to a pudding-like consistency. This usually takes about 8-12 minutes. The custard should coat the back of a spoon and you should be able to draw a line through it with your finger. It might seem like forever, but patience is key! Do not let it boil, or your eggs will scramble.
12. Once thickened, immediately remove the saucepan from the heat. Pour the hot custard through a fine-mesh sieve into a clean bowl. This removes any bits of cooked egg or zest, ensuring your custard is perfectly smooth and silky. You can press on the solids in the sieve to extract all the flavor. Stir in the cold unsalted butter, a piece at a time, until fully melted and incorporated. The butter adds richness and a beautiful sheen.
13. Pour the warm lemon custard into the cooled, blind-baked tart shell. Gently tap the tart pan on the counter a few times to release any air bubbles. Smooth the top with a spatula.
14. Reduce your oven temperature to 325°F (160°C). Carefully place the tart into the preheated oven. Bake for 20-25 minutes, or until the edges of the custard are set but the center still has a slight wobble when gently shaken. This slight wobble is perfect, as it will continue to set as it cools.
15. Remove the tart from the oven and let it cool completely on a wire rack at room temperature. Once cool, transfer it to the refrigerator and chill for at least 3-4 hours, or preferably overnight, before slicing and serving. Chilling allows the custard to fully set and enhances the flavors.
16. Before serving, you can garnish your beautiful tart with fresh berries (raspberries and blueberries are gorgeous!), a dusting of powdered sugar, or a few fresh mint leaves for that extra bright finish. Slice with a sharp, warm knife for clean cuts. Enjoy the deliciousness!