Done well, roasted are probably the best way to cook them. But getting it right isn't that easy; too many end up with leathery outside rather then crispy/crunchy.
(Not that I partake these days. Maybe I'll make exceptions in about 2½ months' time, if I'm not unwell again.)
I parboil then too. I tried to do roast potatoes with the sliced tops. The trouble was I made the slashes too deep & they fell apart on roasting so all was left was potato slices!!!
We call them hedgehog potatoes, Sharon, one of the family’s favourite ways with potatoes, haven’t made them for ages, maybe time to give them a go again.
I don't always make them myself, but when I do, I part boil them, a little coating of oil, sprinkle a little bit of garlic gradually on them, put them on baking tray on medium heat until desired finish. Very tasty. My friend sprinkles Oxo on hers.
Piggy, I get it in Tescos, but I think it is quite expensive for what it is. If I have roasted a goose (often at Christmas) the fat lasts me for months; I also keep the duck fat if I roast a duck, or the beef fat if I can get a nice bit of lard on a joint. I do tend to keep a large kilner jar of fat that I have poured off a roast and then use that for spuds.