4-6 lb. eye of round, or any other cut
1/2 c. water
1/2 c. ketchup
1 tsp. mustard
1 tsp. Worcestershire sauce

Mix the water, ketchup, mustard, and Worcestershire sauce and pour over the meat. Marinate overnight, then cook and baste in the sauce. Cook at 450 degrees until the internal temperature of the meat is 125 degrees for rare.