Ask him what weird food -- that the average person would be disgusted with -- did he grew addicted to in BC? Or ask him what that is for Michigan. I think the weird idiosyncratic stuff is getting harder and harder to identify.
Somewhat related, I'm almost dismayed to see the "Detroit-style" pizza being lauded all over the place when it wasn't really what I grew up eating in Livonia. But the thing I get when I go back to Michigan, Almond Boneless Chicken is non-existent anywhere outside the bubble of the Detroit suburbs. When I introduced this "wonder dish" to my buddy from upstate NY he was [shrugs] "what the hell is the big deal?"