The flesh also ranges in color from white to yellow, orange or orange-red. Freeze cut, cooked sweet potatoes in a resealable bag for up to 1 year. Mashed, cubed, whole—you can safely freeze any sweet potato that has already been cooked. Starch from the potato will blacken/bruised when exposed to air. Typically, it happens if you boil (or fry) potatoes and then store them—they will sometimes turn black or purple over time if they are exposed to air. Potatoes turning black – good question and here is the short answer… raw potatoes can’t be frozen. Sweet potato contains vitamin A and other healthy nutrients The reason we cook them in the first place is to make them easier to digest. The dark color doesn’t affect the eating quality or taste, but it doesn’t look very appealing. How to eat sweet potatoes before they go bad. Salted water help dissolve the starch preventing bruising. Raw Potatoes. When you cut a vegetable, the enzymes in the cells (Polyphenol Oxidase, in case you were wondering), reacts with the oxygen in the air and the flesh turns dark.It is believed that these enzymes can help some plants to be more resistant to pests, so it has a function beyond irritating you when you open the fridge to a browning half sweet potato! If your knife contains iron, it can also make potatoes darken. Set sweet potato starts into the garden about the same time you set out tomato transplants in spring. "The greenish colour can be due to a natural occurrence, when the water soluble pigments in the cooked sweet potatoes are exposed to air," AVA said. According to the 2016 findings, if you want sweet potatoes with the lowest GI, you should basically do anything but bake them. There is an enzyme reaction that has to take place to keep the potatoes from turning black. When you cut a raw potato, the flesh is exposed to air for the first time and rapidly begins to darken – apples do something similar. Add a tea spoon of salt in a bowl of cold water. Why do potatoes turn black after cooking? Sweet potatoes are a dicot (double embryonic seed leaf) plant from the morning glory family. How about sweet potato pancakes or sweet potato and ginger soup or sweet potato and black bean enchiladas? Potato skins and fruit peels are the natural ways oxygen is blocked from reaching this enzyme. The dark areas, usually at both ends, are often not visible. Potatoes, along with apples, pears, bananas, and peaches, contain an enzyme that, when exposed to oxygen, reacts to produce discoloration on the surface of the potato or fruit. Simply place the sweet potatoes into a bag, squeeze out the excess air, and pop the bag into the freezer. There's no disadvantage to eating sweet potatoes unless you're prone to kidney stones from oxalates. Once they are removed, oxidation begins. Sweet potatoes are usually grown from slips started from roots (to start your own add another 40 days). Don’t run off, however, and eat a bunch of sweet potatoes raw. Then, there are these 52 ways to love sweet potatoes from the North Carolina Sweet Potato Commission. There are many varieties of sweet potatoes with skin colors that can range from white to yellow, red, purple or brown. Get this: In their own skins, sweet potatoes cook up to only 103 calories a pop. Why Potatoes Turn Gray . Why Do Sweet Potatoes Go Brown? Reasons Potatoes Turn Black After Cooking: Potatoes occasionally turn gray or dark after they are boiled; this color change may be caused by the conditions under which they were grown or stored. Sweet potatoes require loose, well-drained soil and about 100 very warm days. Immediately put the peeled potato into the water. The sweet potato is a member of the morning glory family, and is not related to the Yam. 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