This item is not available for pre-order in 2017, but should be available in limited quantities in the fall.
Negra is a Peruvian heirloom variety. Black mashuas are a group of varieties that are used a little bit differently than those of other colors. While they can be used like other varieties, traditionally the black varieties are used more often to make sweet foods and desserts. For example, black mashua is often used to make a sort of marmalade.
The tubers are of medium length and dark purple when they come out of the ground, darkening to almost black with exposure to sunlight.