Preheat oven to 150c.
In a large mixing bowl, beat together all the ingredients until they form a cohesive dough. I used a wooden spoon and did it by hand, but feel free to use your mixer
Lightly sprinkle a work surface with a little sugar and turn out your dough
Roll out until you have a rectangle that is approx ¾" thick.
Place this gently onto your greased baking sheet and prick all over with a fork.
Bake for between 45 minutes to an hour, until it feels firm to the touch, and no longer soft. Make sure it doesn't overcolour.
Remove from the oven, leave to cool for 10 minutes, then carefully cut into fingers. Leave to cool completely.