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: 5 minutes
Prep: 15 minutes
Cook: 10-15 minutes (dependent on size)
Prep: 10 minutes plus 1 month to develop (minimum 1 week)