Mateljan is the founder of Health Valley Foods.
Over a hundred foods appear on the list, each selected because they are especially rich sources of essential nutrients needed for optimal health.
Collard greens are broad-leafed relatives of the cabbage family, related to kale—another high ranking nutrient rich vegetable.
The peak season for collards in the American south is January through April. Collards have a strong connection the Southern cooking.
Collards are thought to have a Scotttish origin, but the Southern style of cooking greens came into its own with the arrival of African slaves who boiled the greens with ham hocks or neck bones.