Adding mustard, horseradish or wasabi to your broccoli has been found to significantly boost its cancer-fighting ability, says a new study published this week.
The secret sidekick is an enzyme called myrosinase which is necessary to form sulforaphane, the vegetable's cancer-preventive component.
When a food item containing the enzyme was eaten with broccoli, scientists at the University of Ilinois found that the combination revved up the production of sulforaphane in both foods.
The study was published online in the British Journal of Nutrition Tuesday.
To squeeze out maximum benefits, pair the broccoli with as much heat as you can, researchers said.
"The spicier, the better. That means it's being effective," said study co-author Elizabeth Jeffrey.
Other foods that contain myrosinase which produced similar results include radishes, cabbage, arugula, watercress, and Brussels sprouts.
In the study, when fresh broccoli sprouts -- which contain myrosinase -- were eaten with broccoli powder, which is rich in sulforaphane but has no myrosinase, scientists observed that the activity of bioactive compounds peaked compared to when the foods were eaten alone.
Researchers out of Oregon State University, meanwhile, were able to prove that sulforaphane selectively targeted and killed diseased cells in prostate cancer while leaving normal cells healthy in their study earlier this year.
For a spicy broccoli recipe, try a sour cream-based wasabi vegetable dip that also calls for horseradish at food.com: http://www.food.com/recipe/wasabi-dip-250576.