Pizza Swiss Steak

Trim excess fat from steak; cut steak into 6 equal pieces. Stir together flour, salt, and pepper; coat meat pieces with flour mixture. Pound each piece of steak to 1/2 inch thickness using meat mallet. In skillet brown meat in hot cooking oil; drain off fat. Place onion in crockery cooker. Place meat atop. Stir together tomato sauce, pizza sauce, water, sugar and oregano; pour over meat. Cover; cook on low heat setting for 8 to 10 hours. Serve steak and sauce over hot cooked spaghetti.