Clean the sweet potatoes and cut into cubes. A fresh pineapple is also halved and cut into cubes. Cut the peppers into long pieces and the half peppers into thin slices. Half the hot peppers are enough for a good heat, if you like it less hot, reduce the amount of hot peppers at this point.
Simmer the chopped tomatoes in a wok over medium heat. Season this with a pinch of sugar, half a tablespoon to a whole tablespoon of curry powder and a little salt and pepper. Add the peppers, pour in the coconut milk and add 1 tablespoon of peanut butter. Simmer the sweet potatoes and peppers in the sauce over low to medium heat. The vegetables are cooked in just 15 minutes. In the last 3-4 minutes, add pineapple cubes to taste. Season to taste with freshly squeezed lime juice.
This dish can also be eaten as a soup (add very few vegetables).