This is one of the most amazing vegetables I've ever seen. They have a form that is similar to fractals, and one year I baked some in the oven, drizzled with a bit of olive oil and salt, and they were delicious. That link under the picture tells you where they came from. I'm pretty sure they weren't around when I was young, or I would have remembered them. They taste a little like cauliflower and are related to both vegetables.
I tried a couple of years ago to plant them in my garden, but they bolted almost immediately and now I let the experts at the Farmers' Market grow them for me.