Made this tonight. Easy, good, and quick. Had mashies with it, and I put the roasted onions from the beef in the potatoes. Also, some sauteed mushrooms completed dinner. Pretty darned good, with minimal work. (I'm so lazy!)I think I got this one from Real Simple, but it was so long ago, I can't remember.
Heat oven to3 75. In roasting pan, toss onions, oil, 1/2 tsp. salt and 1/2 tsp. pepper. Push onions to the edges of the pan.
Season beef with 1 tsp. each salt and pepper and place in center of pan. Roast beef to desired doneness, 65 to 80 minutes for medium rare. Remove from oven when the internal temperature registers 125. Transfer beef to cutting board. Tent loosely with foil and let rest for at least 15 minutes. Slice and serve with the onions.