Gosh there as so many things I don't want to try: organ meats, squid, okra, lukefish, etc.
But, the worst thing I ever tasted was black pudding. We had it in Ireland. It is blood, just blood and a little flour for thickening. It was so gross, but my mom just ate it up and then ate mine as well. She said it had been one of my nana's favorite dishes.