Working there for 20 or 30 years was probably a great gig.
(Lee Iacocca, in his first book, recounted that after Ford said that, he, Iacocca went into the kitchen to see if he could find out the secret. The chef said "Sure, watch." The chef opened a fridge, grabbed a prime cut of steak, ran it through a meat grinder, hand-shaped the freshly ground meat into a patty, and slapped it on the grill.)
I doubt many people would call the Ford Executive Dining room a burger joint, though.