1Heat oven to 350°F. Spray broiler pan rack with cooking spray.
2Mix all ingredients except water chestnuts, mushrooms and pimientos. Shape mixture into 12x10-inch rectangle on waxed paper. Mix remaining ingredients. Spread over beef mixture to within 1 inch of edges; press into beef mixture.
3Roll up, beginning at narrow end, using waxed paper to help roll. Pinch edges and ends to seal. Place roll, seam side down, on rack in broiler pan.
4Bake uncovered 1 hour to 1 hour 15 minutes or until no longer pink in center and juice of beef is clear (meat thermometer should reach at least 160°F). Let stand 10 minutes before slicing.