The dough is made in the mixer; 1lb of butter (!!!!!) mixed up first until light and fluffy then add your sugar and egg yolks.
Then you add your flour and baking powder and the dough is complete, easy peasy. The dough is divided into two balls (or square type things in my case) and frozen for up to 30 minutes.
Once the dough is out of the freezer, one ball of it is grated into the tin, the jam added and then the second ball of dough grated on the top. I had loads of dough left over and I've left that in the freezer to use another time.
Here is the end result
You can see that my icing sugar went a bit yellow from the heat of the shortbread but apart from that they looked lovely and tasted really, really nice. I was planning to freeze half of them as there were far too many but my husband and daughter managed to polish them off (I'm dieting!)