Anyone that can tell me what plant this delicate tall yellow flower belongs to gets 5 points!

Do you give up yet? I'll give you a hint. It's a little out of its growing season. It is normally not quite as tall as in this photo and has wide deeply green leaves. Also, it's edible. That is, the fruit of the plant is edible. It is actually a Brussels sprout plant which bolted!

Just after Thanksgiving last year I decided to try my hand at growing them, even though it was too late in the season. I planted cauliflower, broccoli and Brussels sprouts.

We recently had the last of the yummy cauliflower and broccoli. The Brussels sprout plants gave their fruit to us in a different way. While I was disappointed not to be able to enjoy their flavor, I thoroughly enjoyed the tall (above my waist) yellow spires.

I guess that even when my experiments go awry, there can still be a happy ending!