Preheat the oven to 160℃ Fan (or 170℃non-fan)
Cream together the margarine, sugar, salt, and syrup until light and fluffy
Sift in the flour, ginger and bicarbonate of soda and mix to form a soft dough
Roughly chop the white chocolate and stir into the dough. Add the chopped crystallised ginger, if using.
Form into two balls, each weighing approx. 80g each and place on a lined baking sheet. If you like rolling the demerara sugar before placing on the baking sheet for an extra crunchy exterior
If you have time, place in the fridge for half an hour to chill, but you can also bake immediately
Bake for 11-13 minutes until risen and slightly golden
Move to a wire rack to cool