Didn't read everything maybe this has been mentioned. Got this from a trained chef that was the food and beverage manager at a big fancy hotel. Its simple as hell. Grilling is great but if you want to do it in the house this is the way to go IMO.
Take the meat out of the fridge and rub it up good with spices. Can be as simple as salt and pepper or whatever rub you like but keep it simple and not over powering. Let it sit for an hour until its up to room temperature.
Preheat the oven to 400. Put a shot of oil in a cast iron fry pan or other fry pan that can go in the oven on medium high heat. When the oil is good and hot put the meat in the pan. Sear it quickly on all 4 sides and the ends too using tongs. Remove from the heat let cool slightly and add abot 3/4 inch of water. Add some quartered potatoes, chopped carrots and onions if you like but don't cover the meat. Stick it in the over for about 1/2 an hour or a little more depending on quickness. You're shooting for medium rare do not over cook. Serve with a little horseradish.
