S7, E3: After the Battle of the Apron concludes, the Top 20 home cooks in America meet the first guest judge of the season – culinary icon Wolfgang Puck, who will introduce the season’s first Mystery Box Challenge.  Each contestant will have 60 minutes to create a dish of their choice that features one of the world’s most fundamental ingredients – potatoes! The winner of the Mystery Box Challenge is rewarded with a significant decision going into the season’s first elimination challenge, during which they will have to replicate one of Chef Ramsay’s signature dishes in less than 60 minutes.