When combining the wet ingredients, add the treacle (molasses) last to the jug. Treacle is super sticky and really hard to mix, despite being more a liquid. However placing it in the bowl last and mixing makes it easier to combine and less likely to stick to the jug.
Leave enough space between the two logs of gingerbread biscotti dough for them to spread when baking. You could use two baking trays too if you prefer.
If you want the biscotti to be a little taller, keep the logs more rounded. If you flatten the logs a little before baking, the final gingerbread biscotti will be more flat and long.
Do not leave the gingerbread biscotti logs to cool completely before slicing as this will make it harder to get clean cuts without the biscotti crumbling. Twenty minutes is perfect.
At the second bake, you can bake the biscotti to get to the texture you prefer. A shorter bake time will give you softer final gingerbread biscotti, a longer bake time will give you extra crunchy and dry biscotti.
The white chocolate dip is totally optional. I love the sweet smooth flavour of white chocolate against the fiery gingerbread flavour, plus I think it looks so lovely if being gifted. You could also do a simple white chocolate drizzle instead of a dip if you prefer.