Lightly butter, or using baking spray, grease a 8 inch or 20cm round tart pan (with removable bottom).
In the food processor, pulse the flour, sugar, and salt to combine (~ 5sec). Add the cold cubed butter and pulse until the pastry starts to come together and form clumps.
Transfer the pastry to the prepared pans and using your fingers, evenly press the pastry up the sides of the pan and onto the bottom.
Gently pierce the bottom of the crust with the tines of a fork. This is to prevent the pastry crust from puffing up while it bakes.
Cover the tart crust with cling wrap and place it in the freezer for 30-40 minutes to firm up. This helps to prevent the crust from shrinking while it bakes.
Preheat oven to 220C. Place the frozen tart shell on a larger baking tray and bake the crust at the lowest rack of the oven. Bake for ~15 minutes or until golden brown. Remove from the oven and set aside to cool. Once cooled, un-mould from pan and chill in the fridge whilst making the filling.