In a food processor combine the all-purpose flour, sugar, and salt. Process for 30 seconds.
Cube the butter and add it to the processor. Process till a crumbly dough is formed.
Add cold milk and process further, until everything comes together.
Take out of the processor and work with hands to smooth the dough.
Use your fingers to press the dough into the tart pan, or in case making tartlets, divide the dough first and then press into the tart pans.
Take care to press the dough in equal thickness. Remove the excess by trimming off the edges using a knife.
Using a fork make holes in the tart.
Cover them and refrigerate for an hour.
Preheat the oven to 350 0 F and bake naked filled with dry beans till they start becoming light brown. Almost 15 minutes.
Take out of the oven, and let cool completely before filling.