Line 2 baking trays with baking paper

In a large bowl, sift the flour, icing sugar and custard powder

Add the thyme

Rub in the butter until the mix looks like bread crumbs

In a small bowl, mix the egg and vanilla together with a fork

Add to the flour mixture

With a butter knife, cut the mixture to form a soft dough

On a clean bench turn out the mix and bring together with your hands

If you find it is a little dry, add 1 teaspoon of milk at this point but it is a dry buttery mix so not too much

Wrap in beeswax wrap and place in the fridge for 1 hour

Preheat the oven to 200 fan bake

After 1 hour, turn the dough out onto a lightly floured bench. Roll out to 2-3mm, thin is good because you are having two joined together when served

With your cookie cutters, cut into shapes, no larger than 5 cm

In half of your biscuits cut out a centre hole, I chose a heart

Transfer biscuits to the baking trays

Pop into the oven to bake for 8-10 minutes or until lightly brown around the edges. Do not over bake these beauties

Cool on the trays for 5 minutes before transferring to a cake rack to fully cool

Once cool, add a teaspoon of jam to the centre and sandwich together

Serve, and store in biscuit tin