These are most popular of the world's healthiest vegetables: kale, cauliflower, broccoli, brussels sprouts, and cabbage. They are called brassicas.
For a long time, brassicas had a mixed reputation. The rising popularity of brassicas is due to their extraordinary health benefits and also they can taste delicious when properly prepared, that is without death-by-boiling or burial under a blanket of cheese.
Roasted brassicas are awesome!