Peel potatoes and cut into generous bite sized pieces. Toss with oil salt and pepper, roast in single layer in baking dish for 20-25 minutes (until tender but not overcooked) at 400C. Let cool to room temp.
Whisk Dressing ingredients until blended. Place potatoes and other ingredients in large bowl, then add dressing. Toss carefully as sweet potatoes are delicate!
Enjoy! Lovely served at room temperature. Keeps well in fridge for two days, so can make ahead.