Onion-Balsamic Sauce

Ingredients

• 1 tablespoon balsamic vinegar 
• 1  beef bouillon cubes 
• 0.5 cup firmly brown sugar light packed
• 1 cup cooking wine dry red
• 3 large purple onions coarsely chopped

Equipment

• frying pan

Directions

1. Cook onion in a skillet coated with cooking spray over medium heat, stirring occasionally, 15 minutes.
2. Stir in sugar; cover and cook, stirring occasionally, 10 minutes.
3. Add wine, vinegar, and bouillon; cook, uncovered, stirring occasionally, until liquid is reduced by half.
4. Serve with tenderloin.