Prepare lemon curd according to recipe instructions and your personal preference.
For the shortbread crust:
Preheat oven to 350º.
Mix together ingredients for the shortbread crust, plus the lemon zest.
Press into the bottom and up the sides of a 10-inch tart pan with removable bottom that has been sprayed with nonstick baking spray or buttered and floured.
Bake for approximately 15 minutes, or until lightly golden brown.
Remove from oven and allow to cool for about 15 minutes.
For the tart:
Preheat oven to 350º F.
Spread lemon curd into the bottom of the baked shortbread crust. Bake 15-20 minutes until the lemon curd has set. Remove from the oven, allow to cool.
Carefully remove tart from the tart pan. Cover serving dish with plastic wrap and store in the refrigerator until firm, at least one hour to overnight.
Just before serving, sprinkle with about 3 tablespoons granulated sugar. Using a kitchen torch, carefully brulee the top of your lemon tart.
Notes
Preparation time does not include chilling of lemon curd.