I spent my life savings on a NYC deli that was infested with rodents. Now, I bring in up to $4,000 a day thanks to 1 viral sandwich.

Source: Business Insider

Business InsiderJoshua Dat invested his life savings to open Datz Deli in Queens with his father. The business struggled at first until Dat created the Mac Patty — a burger with mac and cheese. Dat's family now runs two successful Datz Deli locations, and he's looking to open a third.