Miles,

If you like sweet potatoes, you would love parsnips..

Peel and parboil for just a couple of minutes, (they go soft very easy) and then roast like doing roast potatoes...

They probably take a 10 minutes or so less than roast potatoes but that depends where in the oven they are ect..

Fat for roasting can be one of the various cooking oils, but usually at Chrismas, duck fat is used...not sure if its just in the mind, but it certainly seems to make the roasters tastier..

You guys have bread sauce over there? Not a favourite of mine, but lots of folks like it..

Regards,

Peter