Small, knobby fingerling potatoes have a thin, delicate skin, so there’s no need to peel them. If you can’t find fingerlings, substitute with baby potatoes instead. Be sure to remove the dough from the fridge about 30 minutes ahead; this makes it much easier to handle. Don’t worry if it seems like there’s a lot of radicchio; it shrivels as the pizza bakes.
Source: Clean Eating