salt-roasted potatoes

I love trying the recipes from Cook's Illustrated magazine - this was in their September/October 2011 issue and reminded us of the jacket potatoes we enjoyed in London a few years ago (an inexpensive and filling meal; they can be topped with anything that you like on your baked potatoes).  Nestle potatoes and a head of garlic on a bed of salt.  Cover with foil and roast 75 minutes at 450 degrees.  Uncover, remove garlic (make some roasted garlic butter with it for the potatoes), lightly coat potatoes with olive oil, crank oven up to 500 degrees and roast for another 15-20 minutes.