To make the shortcrust pastry, sift the flour in a large mixing bowl, add the cold butter cut into cubes, and use your fingertips to rub them together until you get a mixture that resembles breadcrumbs.
Add the granulated sugar and mix to combine everything.
Beat the egg well in a small bowl, then add it to the mixture together with the milk.
Knead everything into a dough that does not stick to the hands.
Cover the dough in clingfilm and refrigerate for 20 minutes.
Preheat the oven to 200 degrees Celsius ( 390 Fahrenheit).
Use a rolling pin to roll out the dough, and lay it onto the pie dish, pressing it down gently.
Use a fork to prick the dough in several places.
To remove the excess dough, use the rolling pin to roll it out.
Cover the dough with non-stick paper and arrange baking beans onto the bottom of the pastry.
Bake for 15 minutes, then remove the paper and beans.
Spoon out the mincemeat over the bottom of the pastry.
Cut out star shapes from the ramaining dough, and arrange them over the pie.
Drop the oven temperature to 180 degrees Celsius (350 Fahrenheit) and bake for a futher 15 minutes.
Remove the pie from the oven and allow it to cool down completely in the dish.
Dust with icing sugar.