Broccoli

Peak Season: October to May

Perfect Pick: Rigid stems with tightly formed floret clusters that are deep green or tinged purple. Pass on any with yellowing heads—they will inevitably be more bitter.

Handle with Care: Place in a plastic bag and store in the refrigerator for up to 1 week.

The Payoff: Sulforaphane, which activates enzymes that seek and out destroy cancerous cells.