* Preheat the oven to 170°C/ 350°F/ gas mark 4.
* Sift the flour, baking powder and all the spices into a mixing bowl. Add the sugar and mix well.
* Add the butter. Using just the tips of your fingers, rub together the ingredients until the mixture resembles fine breadcrumbs.
* When all the butter is evenly mixed in, make a well in the centre and add the treacle and bring all together. You will know when it is all mixed in as it will have an even colour all over with not too many streaks of treacle.
* Place the dough onto your clean worktop. Divide into two and squash the dough into two even-sized flat discs. Cover and chill until ready to use or roll out immediately.
* Evenly space the trays in the oven and cook for 14-18 minutes, depending on your oven.