For a 5 lb roast start baking 5 hours before time to serve.
Note this is adapted from the Alton Brown method of cooking a standing rib roast.
A week before cooking: Make a small stand out of crumpled up aluminum foil and put on a plat. Remove the roast from its packaging, wrap in 2-3 layers of cheesecloth, place on the aluminum foil stand and put in the refrigerator. Note it is OK if the roast if frozen as it will thaw in the refrigerator.
A day or so before cooking heavily salt the roast with kosher salt.
A few hours before cooking remove the roast from the refrigerator and allow to come to room temp. Wash the sweet potatoes, wrap the in aluminum foil, and put in a oven proof dish.
When ready to cook preheat the oven to 250 F. Oil the roast with a neutral oil such as canola oil. Heavily season the roast with black pepper and rosemary. Bake the roast for 40-45 min/lb. About 3 hours before the roast is done put the sweet potatoes in the oven with the roast.
When the roast has baked remove the roast (but not the sweet potatoes) from the oven. Set the over to 350 F. Put a tent of aluminum foil over the roast as it rests. Wipe up extra fat in the pan or collect for gravy or Yorkshire pudding.
After letting the roast rest & the sweet potatoes bake for 30-40 min remove the sweet potatoes from the oven and set the oven to 475-500F. Once the oven is at temp remove the tent from the roast, and return the roast to the oven for 10-15 min to sear the outside.
After the roast has seared, remove from the oven, slice, and serve.
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