In a large bowl whisk together salt, flour, sugar and baking powder, make a well in the centre and add egg, egg yolk and butter (cubed), mix together (you can also use a food processor, pulse until dough just starts to come together), remove dough to a flat surface and knead until it becomes a soft dough, wrap in plastic and refrigerate for 30 minutes.
PRE-HEAT oven to 350° (180° celsius) lightly grease and flour a 10 inch (26 centimeter) pie pan.
Remove dough from fridge, roll 3/4 of the dough into 1/8 inch thickness to fill pie plate, the remaining dough roll and you can use a small cookie cutter to make cutouts or make strips for the top of the crostata.
In a medium pot whisk together sugar, egg yolks, egg , lemon zest, lemon juice and cooled melted butter, place on low heat and heat whisking constantly until mixture thickens (this can take a while, so be patient and do not raise the heat) (should be thick enough to coat a spoon really well, once it starts to thicken it will thicken very quickly, so be careful not to burn).
Remove from heat, and fill prepared crostata dough, top with cutouts or strips, brush lightly with milk and bake for approximately 30 minutes, after 15-20 minutes you may have to cover around the top of pie crust as it tends to brown quickly. Let cool completely before serving. Enjoy!
Italian Lemon Crostata https://anitalianinmykitchen.com/lemon-crostata/