What a coincidence, I actually just watched that episode earlier!! If not mistaken they were on 180F for a couple of hours… update Did the rest of my potatoes the traditional way and they were not sweet at all. So for those who fancy sweet ones you may try sv-ing em @194F or holding them between 145F-170F for 2-3 hours (as per Kenji, Serious Eats)before finishing it the way you want.