The Perfect Hamburger

'That,' said Mr Borthwick, 'was the best hamburger I've ever tasted!'
Joe has just created the yummiest, juiciest, most delicious hamburger ever - and his friend Mr Borthwick wants to sell it in his hamburger shop to try and win back customers from the new fast-food restaurant across the road. But there's a problem - Joe has completely forgotten the recipe...

A pinch of this, a touch of that and a spoonful of something else...the race is on for Joe to remember!