I have being preparing these potatoes for years after my father-in-law served them to me on Christmas day. It wasn't for many years later that I discovered the dish originated from Sweden. In Swedish they're called Hasselbackspotatis which translates to Hazelslope Potatoes.
Prep: 30 minutes
Cook: 2 hours
Prep: 20-30 minutes plus 3 hours rising
Cook: 30-40 minutes