Mix flour and sugar together into a bowl. Add salt if you are using any.
Cut the cold butter into tiny cubes or grate it and add to the flour mixture.
Using your finger tips, rub the butter into the flour till it resembles breadcrumbs.Or you can process it in your food processor.
Add ice cold water tbsp at a time to form a dough. Do not knead too much. Just bring the dough together.
Wrap the dough in a cling film.
Chill the dough in the fridge for 30 minutes.
Dust the worktop with little flour.
Roll out the dough into a rough circle that is about
Using cling film or plastic sheets roll out the dough into a circle with a ¼" thickness.
Lightly grease the cups or molds with butter.
Use a cookie cutter which should be bigger than the diameter of the muffin or tart cups. Cut the dough with the cookie cutter. Place the cut shapes in the cups or molds.
Press the dough gently against the wall of the mold or cup. Cut off any excess dough.
Gather up the remaining dough and roll again. Cut into shapes and line the cups or molds.
Prick the pastry with a fork.
Place the tartlets in the freezer for 30 minutes.
Preheat the oven to 200°C.
Cut small squares from the aluminum foil.
Press the aluminum foil gently into the frozen pastry.
Put the tartlets into the oven to bake for 10 minutes.
After 10 minutes, remove the aluminum pieces from the tartlets and put them back in the oven to bake for further 3-4 minutes.
Remove the tartlets from the oven. After 3-4 minutes gently remove the tartlets from the cups or molds gently.
Let them cool on a wire rack.
Store the tartlets in an airtight container till required.