This is one of my favourite things to do to spuds. I don't know about the rest of Ireland but my family traditionally eat this around Easter and Halloween. This is my grandmothers recipe so I've tried to make it as user friendly as possible (ie, removed all the "good handful" etc.)
You can add cheese or bacon if you like. You can also hide a penny wrapped in grease proof paper in it if it is a special occasion (like Easter) - whoever finds it will be rich.