Lightly coat an unheated small saucepan with nonstick cooking spray. Preheat saucepan over medium heat. Add onion and garlic; cook and stir about 5 minutes or until onion is tender. Stir in the water, tomato paste, vinegar, brown sugar, chili powder, oregano and Worcestershire sauce. Bring to boiling; reduce heat. Simmer, uncovered, about 10 minutes or until desired consistency, stirring occasionally.