Note: Beef Sirloin (or Round) Tip Center Roast is cut from the Beef Round Tip, Cap Off (IMPS/NAMP 167A) by following the natural seams to separate the tip side, tip center and tip bottom. The tip center is left whole and sold as a roast. Average weight is 2 to 2-1/2 pounds.
RECIPE FROM "BEEFITSWHATSFORDINNER.COM"
*** UPDATE 10/29/08 - Remember that this is a tough cut of meat if overcooked. Cooked to medium, it is very chewy and you'll have to cut it in 'wafer' thin slices, medium rare is the most you can get away with. I tried this on a cut of cross rib and the seasonings overpowered it so let me know if you have any luck using with different cut of meat. I have cooked it too long and although had great flavor was just to rough to eat for my taste, so I used for stew meat the next day..