Twice-cooked Potatoes

I used the lower grade Idaho potatoes for this- they looked like perfect little Idahoes, but were only about 4" long (20 lbs for $1.99, how could i resist?) Russets would probably work well, too. I think Yukon Golds and other thin-skinned varieties would tend to fall apart. Seriously, using the right potatoes for any recipe can matter! fanatical grin ;).