two nonstick 6-inch fluted tart pans with removable bottoms
Preheat the oven to 375 degrees F.
Grate the butter on a box grater and add to the bowl of a food processor with the flour, 1/4 cup of the sugar and the salt. Pulse to combine until the mixture resembles Parmesan cheese. Add the egg yolk and 3 tablespoons of ice water. Pulse to combine until the dough comes together and holds its shape when pressed between your fingers. Turn the dough out onto a floured work surface. Gently knead a few times and bring the dough together into a ball, then flatten into a disc. Roll the dough out evenly into a 1/4-inch-thick circle. Transfer the dough onto a sheet tray and cover with plastic wrap. Place into the fridge to rest for 30 minutes.
Remove the dough from the fridge and roll evenly in all directions, making sure it doesn't stick to your work surface and dusting with flour as needed. The dough should be about 1/8-inch thick. Slice the dough in half and transfer to two nonstick 6-inch fluted tart pans with removable bottoms. Press the dough snuggly into the edges ensuring the dough runs fully up the side. Use a rolling pin to trim the excess dough. Line each tart with a piece of foil and fill with baking beans (or I use rice!), making sure the foil is tightly packed to the corners. Transfer the dough to the oven to blind bake for 6 minutes. Rotate the pan, then bake for another 6 minutes. Remove the foil and baking beans and place the tart back into the oven until lightly golden, another 4 minutes. Set aside to cool.
Set up an ice bath. Add the cornstarch and 1/4 cup of the heavy cream to a small bowl. Mix to create a slurry and set aside. Add 1/2 cup of the sugar and the 4 whole eggs to a large bowl and beat with a whisk until pale yellow and foamy. Add the remaining 2 cups heavy cream, the remaining 1/2 cup sugar, the vanilla extract and lemon peel to a small saucepan and whisk to combine. Turn the heat to medium-high and bring to a boil, then pour half of the mixture into the bowl with the eggs and sugar and immediately whisk vigorously to combine and temper the mixture. Pour the contents of the bowl into the saucepan and continue to whisk. Add the cornstarch slurry and whisk to combine. Reduce the heat to medium-low and continue to whisk until the mixture begins to thicken and it reaches the texture of pudding, 3 to 4 minutes. You want to continuously whisk to avoid scorching the mixture. Strain through a fine mesh strainer into a bowl. Set the bowl over the ice bath to cool.
Place the apricot preserves and a splash of water into a small saute pan. Turn the heat to medium and stir to gently melt the preserves, about 5 minutes. Set aside.
To assemble the tart, spoon an even layer of the lemon pastry cream into each tart shell, but not fully to the top. Line the outside of the tart with raspberries and working inward, arrange the inside of the tart with the sliced strawberries. Repeat this process alternating with more raspberries and strawberries. Glaze the top of each tart with the apricot mixture.
Serve the tarts with a dollop of whipped cream. Enjoy!