* Preheat the oven to 126°C
* In a large bowl combine the butter, sugar, golden syrup, eggs, pistachio extract and the finely chopped pistachios and mix on a slow speed until all the ingredients are combined. When the ingredients are mixed together, increase the speed of your hand held mixer so that all the lumps disappear.
* Sift in both the flours and mix together until the mixture forms a smooth dough. Wrap the dough in cling film and place in the fridge for 30 minutes.
* Place the dough on a sheet of parchment and begin by gently squashing the dough down with a rolling pin or your hands. Cover with a second sheet of parchment and then use the rolling pin to roll out properly.
* The top sheet of paper may crinkle from time to time, just peel it off and smooth it down gently before starting to roll again.
* Use a rectangular shaped cutter to cut the dough into 20 letter shapes, if you cant find a cutter you can always try free hand but using a sharp knife (different sizes will look very authentic). Place on parchment paper.
* Bake in the middle of the oven for 26 minutes or until the biscuits are slightly golden in colour.
* When the biscuits are evenly cooked remove the trays from the oven and transfer the whole sheet of parchment to a cooling rack. Do this carefully as the biscuits will be quite fragile and hot!
* Cool totally before starting to ice