Balsamic Onions

2 c vertically sliced onion
1/2 c dry white wine, divided
1 tbsp brown sugar
1/2 tsp dried thyme
1/4 tsp black pepper
1/4 tsp kosher salt
1 tbsp balsamic vinegar (see below)

Combine onion, 1/2 cup wine, brown sugar, 1 teaspoon thyme, and 1/4 teaspoon each black pepper and salt in a large skillet. Cover and cook over medium heat 20 minutes or until onion is soft, stirring occasionally. Add vinegar, cook, uncovered, 15 minutes or until liquid almost evaporates and onions are caramelized.

balsamic vinegar, substitute a mixture of : (1 tbsp)

3/4 tsp red wine vinegar and
1 1/2tsp extra-virgin olive oil
3/4 tsp brown sugar