About 1 3/4 hours before serving: In 5 quart Dutch oven or saucepot over high heat, cook ground beef and onions until pan juices evaporate and meat is well browned, stirring occasionally. Remove Dutch oven from heat. Add cabbage, carrots, pepper and 2 1/2 teaspoons salt. Toss to mix well. Pour rice into 3 quart casserole. Spoon beef mixture on top of rice. Pour beef broth and 1/2 cup water over mixture. Cover. Bake 1 hour and 15 minutes in a 350 degrees oven. To serve, stir ground beef with rice to mix well.