Meanwhile, in 3-qt. saucepan, heat 2 t. oil over med. heat. Add onion & cook 8 to 10 min. or until tender & lightly browned; transfer to sm. bowl. In same saucepan, in remaining 1 t. oil, cook beef over med.-high heat 3 to 4 min. or until browned, breaking up beef with side of spoon. Stir in tomato sauce & onion; het to boiling.
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