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Oca is cultivated primarily for its edible stem tuber, but the leaves and young shoots can also be eaten as a green vegetable. Mature stems can be used similarly to rhubarb. [13] Andean communities have various methods to process and prepare tubers, and in Mexico oca is eaten raw with salt, lemon, and hot pepper. [3]
Red or purple tuber varieties appear to have a high concentration of betacyanins. A high concentration of betaxanthins is responsible for the yellow or orange coloring of the tubers. In comparison to the three other Andean tuber crops - native potato, oca, and mashua - the antioxidant capacity of the ulluco is low.
The tubers that display both yellow and purple hues demonstrate a considerably higher vitamin C concentration, with a range of 0.9 to 3.36 mg/g dry matter. [18] In comparison, potatoes, a more commonly known tuber, have a lower vitamin C content, with a range of 0.27 to 0.87 mg/g dry matter. [ 24 ]
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In Australia, the tubers of the Microseris lanceolata, or yam daisy, were a staple food of Aboriginal Australians in some regions. [7] In New Zealand, oca (Oxalis tuberosa) is typically referred to as "yam". [8] [9] In Malaysia and Singapore, taro (Colocasia esculenta) is referred to as "yam". [10]
The fleshy, juicy edible tubers of the oca (O. tuberosa) have long been cultivated for food in Colombia and elsewhere in the northern Andes mountains of South America. It is grown and sold in New Zealand as "New Zealand yam" (although not a true yam), and varieties are now available in yellow, orange, apricot, and pink, as well as the ...