1. Coat a nonstick skillet with cooking spray, and add oil; place over medium-high heat until hot. Add onion, and cook 5 to 7 minutes or until tender, stirring often. Add wine; cook 2 to 3 minutes. Stir in tomato, bell pepper strips, and salt; bring to a boil. Reduce heat to low; cover and simmer 15 minutes.
2. Add broth and 1 mint sprig; cover and simmer 15 minutes. Remove from heat, and allow to cool to room temperature. Remove mint sprig, and discard. Garnish with remaining mint sprigs.