My current secret common food I haven't tried shame -- "Tamales"
I've worked in many businesses where coworkers had very authentic cook relatives bring them to work. Live in a city with many places I could have tried them. I watch shows about how to make them.
My shame? I'm not exactly sure how to eat them so i avoid them. What is you secret common food you just haven't tried. and feel maybe guilty, or maybe not guilty about.