* Beat butter, sugars together until light an fluffy
* Add yolk & treacle, mix well
* Sift flour bicarb, Quatre Epice & salt
* Add to cream mixture and mix well till combined
* Lay sheet of glad wrap on bench, form dough into a log 15cm long & 4cm on diameter, on top.
* Wrap tight in glad wrap, refrigerate for 30 minutes before slicing ( you can leave in freezer if you only want to use half the mixture and cook the rest at another time)
* Pre heat oven to 180C
* Cut into 5mm slices, put sugar into bowl to dip slices
* Place on lined baking tray sugar side up, space well apart. Bake for 8-10minutes or until dark golden
* Leave to cool for 5 minutes, transfer to wire rack to cool
Note: The buscuits will spread far ensure you allow plenty of space