In parts of England and Wales there is a tradition of eating a particular kind of seaweed cooked into something called laver bread (or lava bread). And in Tokyo there is a statue of the British scientist who discovered the (very strange) life cycle of this kind of seaweed, because her research allowed Japanese nori farmers to stabilise their seaweed production.
I've eaten English seaweed cooked Chinese-style, but never laver bread. And I've never knowingly eaten dandelions.
Finally, to continue with the 'bladder wreck' style jokes, it may or may not amuse some people to know that the French name for dandelions translates as 'piss in bed'.