‘That,’ said Mr Borthwick, ‘was the best hamburger I’ve ever tasted!’Joe has just created the yummiest, juciest, most delicious hamburger ever – and his friend Mr Borthwick wants to sell it in his new hamburger shop. But there’s a problem – Joe has completely forgotten the recipe and the shop is opening very soon.A pinch of this, a touch of that and a spoonful of something else…the race is on for Joe to remember!