At Alfred's Steakhouse in San Francisco, these potatoes are baked early in the day, then held in a warming oven. They're crisped to order over smoking-hot mesquite coals.

Preheat oven to 375° with rack in middle. In a large bowl, mix oils. Scrub and dry potatoes. Rub each thoroughly with oils and sprinkle generously all over with salt.
Bake directly on oven rack until skins are very crisp and a fork slides in easily, 1 1/2 to 2 hours.
While potatoes are still warm, score an X in top of each. Using a kitchen towel, squish potatoes from sides into center so that soft, steamy potato flesh bursts up through the X. Into each X, nestle 1 tbsp. butter, then top with 2 tbsp. sour cream. Sprinkle with chives.
Make ahead: Up to 2 hours at room temperature. Recrisp skins on a hot grill (or under broiler), turning often, 5 to 10 minutes.
0 servings
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.