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.

Business Insider Joshua 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. This as-told-to essay is based on a conversation with Joshua Dat, 33, owner of Datz Deli and creator of the Mac Patty in New York City. It has been edited for length and clarity. My dad is an amazing chef. He...