Jeff and his son Lorenzo head up to the Mars Cheese Castle in Wisconsin in search of the perfect cheese. With the help of the resident cheesemonger, they taste a staggering array of cheeses and even grill a few up to check their "meltitude" to figure out which ones will accompany them back home. Once back in their kitchen, father and son get slicing as they pile up both adult and kid versions of the venerable cheese steak, and then Jeff melts down a block for cheddar for a classic Wisconsin Beer Cheese Soup.