The sweet potato is prepared like a potato, but it cooks faster and it is naturally sweet. In the oven as fries or wedges, as mash, or in dice in a soup.
Firm, with no soft spots or cuts. The small and medium ones cook more evenly.
Scrub it under water. Its skin is thin: you can leave it on in the oven, or peel it with a peeler for a mash or a soup.
One minute.
Out of the fridge, cool and dark, one to two weeks. Cooked, in the fridge three days.
The page "Oven-roasted vegetables": sweet potato wedges, twenty-five minutes.