Creating an Authentic Italian Torta della Nonna can be both simple and rewarding. Follow these easy steps to make your own delightful tart:

1. Make the Pastry: In a large mixing bowl, combine the diced butter, all-purpose flour, sugar, egg, egg yolk, vanilla extract, and salt. Mix until a dough forms.
2. Chill the Dough: Wrap the dough in plastic wrap and refrigerate it for at least 30 minutes, allowing it to firm up.
3. Prepare the Custard: In a saucepan, heat the milk until it’s just below boiling. In a separate bowl, whisk together the egg yolks, sugar, cornstarch, and lemon zest.
4. Combine Mixtures: Gradually pour the hot milk into the egg mixture, whisking constantly. Return the combined mixture to the saucepan and heat over medium heat, whisking consistently until thickened. Remove from heat and add the butter and vanilla extract.
5. Cooling the Custard: Transfer the custard to a bowl and cover it with plastic wrap, pressing it directly onto the surface to prevent a skin from forming. Let it cool at room temperature.
6. Preheat Oven: Preheat your oven to 350°F (175°C) during this time.
7. Roll Out the Dough: Once chilled, roll out the dough on a floured surface to a thickness of about ¼ inch.
8. Prepare the Tart Pan: Grease a tart pan and line it with the rolled-out pastry, ensuring to leave some overhang. Prick the base with a fork to prevent puffing during baking.
9. Fill the Tart: Pour the cooled custard into the pastry shell, spreading it evenly.
10. Add Toppings: Scatter pine nuts or sliced almonds on top of the custard to add a delightful crunch.
11. Bake: Place the tart in the oven and bake for 30-35 minutes, or until the pastry is golden brown and the custard is set.
12. Cool Completely: Allow the tart to cool in the pan for about 30 minutes, then carefully transfer it to a wire rack to cool completely.
13. Dust with Powdered Sugar: Before serving, dust the top of the tart with powdered sugar for an elegant finish.

Following these steps, you’ll create a beautiful and delicious Torta della Nonna that will impress your family and friends.