Yacon

Yacon (Polymnia sonchifolia) is a tuber grown originally in the Andes mountains. The edible tuber is sweet and crisp and can be peeled and eaten raw, boiled or baked. Aside from being very nutritious it is also low in calorie and high in inulin (fiber). The people at Seeds of Change say it is very easy to grown and offer small plants for sale. They also mentioned the tubers are hard to start from seed.

Jicama