I boil the purple ones.
Then fry a little garlic in some olive oil .
Slice the boiled potato and toss it in the hot
oil and garlic and fry for a few minutes.
Waalaa ! hash browned sweet potatoes.
A lot of people don't like the purple potato but it has the most vitamins.
If you bake it it is really dry so I always boil them, but
I bet they would be good pressure cooked too.
The others white or yellow I just bake and butter.
Curry sounds good though.