Mark had a recipe for lean sweet potatoes. I can't find it. Help

By the way, someone asked my favorite sweet potato recipe. This is it: You wash them, well. You poke some holes in them with a skewer or thin-bladed knife (they have been known to explode otherwise). You bake (in a pan, on a sheet, whatever) them at 425 until they're quite soft. And then you serve them, with butter and salt. Honestly you cannot do any better.

I need a little more of a description.