Portillo’s is a fast-casual restaurant chain considered a one-stop-shop for iconic Chicago foods. Founded in 1963 in the Southwest suburbs of Chicago, Portillo’s is known across the country for its hot dogs, Italian beef sandwiches, cheese fries, and chopped salads. But its best-kept secret is the restaurant’s cake shake. Insider's Medha Imam visited Portillo’s Summit, IL location to learn what goes into making the iconic cake shake. Rumor has it they put an entire slice of chocolate cake into their milkshake, making it a must-try dessert. MORE LEGENDARY EATS: Peter Pan Makes The Best Doughnuts In Brooklyn | Legendary Eats https://www.youtube.com/watch?v=ZADrt3yaPeM New Jersey’s Iconic Sloppy Joe Is Made With Russian Dressing And Cold Cuts | Legendary Eats https://www.youtube.com/watch?v=wpNFsK9lxqc The Best Cinnamon Rolls In Chicago | Legendary Eats https://www.youtube.com/watch?v=2FXIlBUZktE ------------------------------------------------------ #Chicago #Cake #FoodInsider Insider is great journalism about what passionate people actually want to know. That’s everything from news to food, celebrity to science, politics to sports and all the rest. It’s smart. It’s fearless. It’s fun. We push the boundaries of digital storytelling. Our mission is to inform and inspire. Subscribe to our channel and visit us at: https://www.insider.com/ Food Insider on Facebook: https://www.facebook.com/foodinsider/ Food Insider on Instagram: https://www.instagram.com/thisisinsiderfood/ Food Insider on Twitter: https://twitter.com/InsiderFood Insider on Snapchat: https://www.snapchat.com/discover/Insider/4020934530 Insider on Amazon Prime: https://www.amazon.com/v/thisisinsider Insider on TikTok: https://www.tiktok.com/@insider Food Insider on Dailymotion: https://www.dailymotion.com/foodinsider Chicago’s Famous Cake Shake Is A Portillo’s Staple | Legendary Eats | Food Insider