Put the fat and icing sugar in a mixing bowl and beat together with an electric whisk until pale and fluffy (about 1 minute).

Add the vanilla and egg yolk and beat for a further minute

Add the xanthan gum and mix well to combine then add the flour (and water if you are using coconut oil)

Work into a dough, kneading it a bit to bring it into a smooth ball

Flour a clean surface and knead the dough until smooth

Roll the dough out to a thickness of about 3mm. Using a 4-5cm cutter cut out an even number of circles. Using a smaller cutter, or a piping nozzle (for icing!) cut a small hole in the middle of half of the biscuits.

Transfer the biscuits to well greased or lined baking trays ( I used 2 for half the mix). Don't worry about spacing them out because they do not grow!

Bake in a pre-heated oven for 10 minutes at 190 degrees of 170 degrees (fan oven).

Remove from the oven and place a small dollop of jam in the centre of the whole circles. Stick a biscuit with a hole in it, over the top.

Place back in the oven for a further 2 minutes.

Transfer the biscuits to a wire rack after a few minutes and allow to cool before eating them. Yes, wait for them to cool! I couldn't wait either so I don't know why I am saying that!

Admire your work and wait for the squeals from the kids when they see them!