Shake flour in Reynolds oven bag; place in 13x9x2 inch baking pan
Add tomatoes, sugar, mustard, salt and pepper to oven bag. Squeeze oven bag to blend in flour.
Pound beef o 1/8 to 1/4 inch thickness, using a meat mallet or rolling pin. Cut beef into 2 pieces. Add beef to oven bag. Turn oven bag to coat beef with sauce. Arrange beef in an even layer in oven bag.
Close oven bag with nylon tie; cut six 1/2 inch slits in top.
Bake until beef is tender, 45 to 50 minutes
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