It's almost impossible to improve a classic biscuit, such as the shortbread produced by Dean’s of Huntly.The 40-year-old recipe was perfected by Helen Dean back in the 70s and remains the same today, with son Bill now overseeing production.World famous, they are exported across the globe but are also available on Aldi’s shelves in the Specially Selected range that celebrates the best of Scottish provenance.Die-hard traditionalists might always reach for the All Butter Shortbread Fingers, but