Serious Eats - seriouseats.com

Beets and turnips. Can't get around the metallic taste either. Used to hate brussels sprouts, but found a way to make them yummy (roast them!).

As to the "sea urchin roe" detester, I can guarantee you have never tasted nor even seen sea urchin roe. Uni, which is the food that comes from the sea urchin is, in fact, gonads. When you order sea urchin in a sushi restaurant, you are getting the testicles from the hermaphroditic aquatic hedgehog. But I know what you mean. Uni is not my favorite either. Nor are crab brains, which I was served many times when I lived in Japan. For that matter, any kind of brains--sweatbreads from cattle, etc.

Back to gonads. There's a lovely restaurant in Oklahoma City, OK called Cattlemen's. They serve a dish called "lamb fries." We ordered it and ate it up with relish without knowing it was, you guessed it, lamb testicles. All I can say is they were incredibly tender and tasty.