I noticed this vegetable in a Paris marché a few years ago but didn't have the French language skills to ask what the heck it was. I've never seen it in the US, even here in Northern California, foodie capital of the West. I especially love its geometry and rosettes that are fractal formations. Is it broccoli? Cauliflower? After a little research, I've discovered it's called Romanesque Broccoli here in the US and Chou Romanesco or brocoli à pomme in France.
Although I'm not much of a cook, I definitely plan on buying one and tasting it. If my attempts to prepare it fail, I'll stick with using it as a centerpiece or vegetable sculpture.