Sweet potatoes come originally from South America, and taste, as the Name suggests, is relatively sweet. They consist, for the most part of carbohydrates and hence contain a relatively large number of calories. So 100 grams of it bring sweet potatoes to 111 calories. Normal potatoes contain only about 70 calories.
Sweet potatoes can be prepared in principle in the same way as ordinary potatoes. They can be boiled, fried or cooked. The sweet potatoes make a great side dish to fish or meat, pureed or as a soup.