Preheat oven to 350. Shake flour in bag; place in 13X9X2" pan. Add undrained tomatoes, soup mix, water & pepper to bag. Squeeze bag to blend ingredients. Add beef to bag. Turn bag to coat beef with sauce. Arrange ingredients in an even layer. Close bag with tie; cut six 1/2" slits in top. Bake until beef is tender, 40-45 minutes. Serve over hot rice.