Pop your speculoos biscuits and brown sugar in a blender or food processor and give them a quick spin until nicely crushed and blended.
Next pour in your evaporated milk and give it all another good spin for around a minute.
Finally, throw in your butter, lemon juice and ground cinnamon and give everything another good pulse. The resulting mixture should be smooth, glossy, and near irresistible. Good luck and enjoy your speculoos adventures!
