When doing a rib roast as small as three ribs I like to go high high heat. I lard it in a few places with pork fat soaked in red wine and some smashed garlic, rub with much kosher salt and black pepper, rub it down with butter or olive oil. It's at room temperature, the oven is pre-heated to 500. In a cast iron skillet I sear the meat on all sides and stand it on the ribs, open the over door, shove it in and close the door. And walk away. Seven minutes per rib, then turn off the oven and leave it for an hour. Let rest. Carve.