Heat oil in a medium skillet and sauté onions for 2 to 3 minutes. Add all remaining ingredients and bring to a boil. Reduce flame to medium-low and simmer 5 to 7 minutes. Serve hot or chilled.
Per serving - 161 calories, 3 g fat (15% calories from fat), 6 g protein, 27 g carbohydrate, 7 g fiber, 0 mg cholesterol, 153 mg sodium