This is where Jeff Mauro found the perfect provolone and aged cheddar for his grilled cheese sandwich. With more than 350 cheeses and a variety of beers and meats housed in a castle-like building (turrets included), Mars Cheese Castle deserves to be called the "Kingdom of Cheese."

On The Best Thing I Ever Ate, Troy Johnson celebrates his love of a Wisconsin favorite with none other than beer-battered fried cheese curds. Also try the Old Fashioned House Burger. Made from local beef, it’s topped with fried onion, bacon, cheddar cheese, garlic sauce and a soft-cooked egg.

Jeff Mauro visited Graze for its "spot-on" veggie burger made with beets and walnuts. This Madison, Wisconsin, restaurant sources its ingredients from local small farms, and its eclectic menu includes Asian dishes such as bibimbap and pork buns. The Korean-Style Nachos topped with beef bulgogi and kimchi are a popular pick.

Le Reve's menu evokes a French bistro with plates such as crepes and the Filet de Boeuf sandwich (beef tenderloin with Cambozola cheese). But it was the restaurant's patisserie that led to a visit from Jeff Mauro. How could the Sandwich King pass up giant macarons spanning 8 inches across?

Burger Boss brings a new level of dedication to burgers. Meat is sustainably raised and is served with eco-friendly containers and utensils. When Sandwich King Jeff Mauro visits the Burger Boss, he opts for the bologna burger topped with an adobo-chipotle honey sauce.

Russell's Barbecue in Elmwood Park has served barbecue to loyal Chicagoans since 1930. It has loads of history behind it. In fact, Jeff Mauro's love affair with barbecue pork began here years ago. Douse everything on your plate — from ribs to beef to fries — in Russell's barbecue sauce.

For more than 30 years, Jeff Mauro's favorite place to get an Italian beef sandwich has been Johnnie's Beef in Elmwood Park near Chicago. The thin-sliced roast beef is dripping in au jus and topped with sweet peppers, creating a hot and juicy sandwich that has been a local favorite for decades.

With a cafe in Elmwood Park and a takeout spot on Navy Pier, Massa is renowned for authentic paninis, pizza, fried dough and other Italian specialties. Jeff Mauro swung by for the Italian stuffed Panzerotti, and locals recommend concluding any date night here with authentic, otherworldly gelato.

At Jimmy's Place, everything is made in-house from scratch daily using family recipes for authentic Chicago-Italian food. Jeff Mauro went to this popular restaurant searching for the secret to its delicious bone-in Chicken Vesuvio to create an inspired Chicken Vesuvio Sandwich.

For more than 30 years, Chicagoans like Jeff Mauro have headed to one of Pita Inn’s various locales for mouthwatering Mediterranean cuisine. A favorite is the shawarma meat, which Jeff calls “so succulent and so juicy.” And almost every entrée entree comes with warm pita bread baked right on the premises.

When Jeff Mauro looks for inspiration for turning dessert into a sandwich, he looks to the masters at Sugar Fixe Patisserie in Oak Park, Ill. These pastries put a spin on classic favorites; be sure to try the almond croissant sandwich filled with almond cream and topped with toasted almonds.

Jeff Mauro swung by Poor Phil's for a meal worthy of a Sandwich King. In addition to snow crab claws and lobster tails, try the Catty'Boy po' boy sandwich made with a blackened catfish that has the perfect level of spice.

Growing up in Chicago, Jeff Mauro would always stop by Danny's Deli for the fried meatball sandwich. This spot features all kinds of Italian favorites, including classics like rigatoni in vodka sauce and stuffed artichoke, as well as lesser-known dishes like pork neck bones.

Stop in at Marion Street Cheese Market and say hello to “the big cheese,” Executive Chef Leonard Hollander. Jeff Mauro’s glad he did. Hollander’s beloved Cauliflower Sandwich has become a favorite with regulars who crave its delectable combo of fried cauliflower, sliced apples and curry aioli.

Established in 1946, Gene and Jude's helped shape the famous Chicago-style hot dog (perfect for any game day), which comes with mustard, relish, onion, tomato, celery salt, pickles and pickled sport peppers on a poppy-seed bun. These fan favorites are a must for any lover of good ole Americana.