Cold roast spuds?
Can be delicious. They seem to concentrate the flavour.......but obviously the texture isn't great.
Talking of roast potatoes, and cold, the very best of the best is made by par boiling the day before, draining and allowing to cool. Refrigerate over night, then straight into a sizzling hot oven with plenty of goose fat. You'd have to torture me to get my secret herb combination!