Corn
I am a child of corn.
There was corn everywhere where I grew up - like just wild corn, growing alongside the highway. I asked once who grew it. It just grew there. Go fig. Monsatan constantly suing farmers for using their genetically developed superseeds and here's some rando wild corn, just growing alongside the highway. Huh.
Anywhere I go I respect a culture more if they like corn. Show me your cuisine and chances are yes, I'll love it, I'm a bottomless pit of a stomach (actually I hate fish / sushi - but soba noodles are a good workaround) / however, if you suddenly reveal your cuisine includes corn? Boom. Friend for life.
Random side note: The Japanese put corn on top of pizza. I used to think it was weird, now I feel like I've been culturally seen somehow and I am very, very impressed.