I boil mine Dave.
Peel and then chop of ends
Cut into chunks or slice
Weigh out the amount you need
Add to saucepan of cold water and put on the hob set to high
Set timer to 30min
Once boiling, turn down to medium heat and simmer until done.
Sweet potatoes are also only 54 on the Glycaemic Index compaired to a baked potatoe of 85 which is high.