I bought 2, 5lb beef loin New York style roasts it came out perfect and right under 2 hours!
1/4 C red wine vinegar
2 Cups spicy Mustard
generous amount of Pepper
mix all together, then spread all over roast
fat side up in oven at 500 degrees for 20 minutes this will sear the meat!
turn down to 350 for another 1hr 1/2