Gluten-free Orange Shortbread Christmas Trees

It's very easy to make these yummy Gluten-free Orange Shortbread Christmas Trees. I used Doves Farm Gluten Free Plain White Flour and ordinary cornflour, but you could use Doves Farm Gluten Free Organic Cornflour to be sure it really is gluten-free.
Turn on your oven to 170º C, 325ºF or Gas Mark 3, and grease two flat baking trays.
You will need: (see my Metric Conversion Chart on page above)
8oz Butter
4oz Icing Sugar
8oz Plain flour (Doves Farm)
4oz Cornflour
Pinch salt
The grated rind of one orange
Caster Sugar to sprinkle
I made it in my food processor, mixing all the ingredients together, but you could cream the butter and sugar together, then mix in the the flour, cornflour, salt and orange rind, until you have a smooth dough.
Roll it out and cut out the Christmas tree shapes, and place them on the baking trays. Cook for about 20 minutes. As soon as you take them out of the oven, sprinkle with the caster sugar and leave to cool. Keep in an airtight tin, or you can freeze them for Christmas Day.
It's also possible to use lemon rind instead of orange for a change.
I hope that you enjoy them!