For me, warm buttered spinach heaped on buttered chunky white bread, seasoned with salt n pepper and Marmite.
When I was a kid my dad found it was the only way he could get me to eat spinach which he thought, rightly as it turns out, was a superfood.
It's still something I indulge in every so often.
I also like Escargot, (edible snails) and Frogs legs. This came about when I was "entertaining" at the old Carousel fun pub years ago and they formed part of a "revolting food" eating contest. I tried them before getting the punters up to scoff them as quickly as possible. The only difference was that mine were just as they came, the contestant's versions were covered with custard.
Oddly, as far as I remember, only one person ever threw up.
And to think the prize was a free pint.