Mincemeat & Bramley Apple Meringue Tart

For the pastry:

175g white flour

75g butter

pinch of salt

1 beaten egg to bind

For the filling:

450g mincemeat

125g Bramley apples

For the meringue:

3 egg whites

175g caster sugar

egg wash

icing sugar to dust

edible sparkly glitter (optional)

1 x 23cm tart tin (2.5cm deep)