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: 20 minutes (plus 30-60 minutes resting time)
Cook: 2-3 minutes
Prep: 30 minutes
Cook: 20 minutes
Prep: 20-30 minutes
Cook: 8 minutes