A timeless Italian classic: Torta della Nonna

Ingredients

For the shortcrust pastry:

250g all-purpose flour
100g cold unsalted butter, cut into cubes
75g granulated sugar
1 whole egg
1 tsp baking powder
Pinch of salt
Zest of 1 lemon (optional but recommended)
For the custard filling:

500 ml whole milk
4 egg yolks
100 g sugar
40 g cornflour
1 tsp vanilla extract
Optional toppings:

Pine nuts (traditional)
Powdered sugar (for dusting)
Instructions

Prepare the dough:

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