When it comes to onions, think stinky.

Bitter, strong, pungent onions tend to have more cancer-fighting compounds than milder, sweeter bulbs. Here are the varieties that recently tested best.

Truly, you'd do well with any kind of onion on your sandwich -- they're not only cancer-fighters but also proven artery protectors. But a Cornell researcher declared that out of the onion varieties he tested, shallots -- that member of the onion family often described as a cross between onion and garlic -- had the most potential to do good things for people's bodies. The mighty shallot's off-the-charts phenolic content gave this bulb the edge.

Here are the four onion varieties that tested best for antioxidant power:

1.	Shallots
2.	Western Yellow
3.	New York Bold
4.	Northern Red

Recipe Corner
Get your love affair with shallots started by trying this Broccoli with Caramelized Shallots recipe from EatingWell.com.