on cruciferous vegetables

Freshly steamed broccoli, asparagus and green beans are high on my top 10 list of best foods ever, so I've steamed a fair amount in my day. I recently started switching to more organic produce and purchasing more of my veggies from Trader Joe's. Tonight I steamed some broccoli from TJ's and for the very first time in my existence, the steaming water didn't turn green.

This freaks me out a little because what kind of mutant broccoli that leaks green into the waterhave I been eating?