It's because the booger (excuse me, burger
) is made out of ground Japanese Kobe beef. Kobe beef is probably the tenderest and most expensive cut of beef in the world, so tender you don't need a knife!
Never had Kobe beef (never had a job that could justify buying Kobe beef and writing it off as a travel expense!
) but I feel it's sacrilege to grind it up to make it the world's most expensive hambooger. (Er... hamburger!
)