Avocado BLT Burger with Caramelized Balsamic Onions

Description:

Ingredients:

1 T. olive oil
1 sweet or white onion, halved and thinly sliced
1 T. balsamic vinegar
1 T. beef or chicken broth
1 T. brown sugar
2 cloves garlic, minced
1 pound ground chuck (80/20)
1 pound ground sirloin (90/10)
¼ cup finely chopped onion
¼ cup Pinot Noir or other red wine
1 T. minced fresh oregano
1 T. Worcestershire sauce
2 tsp. seasoned salt
4 T. butter
6 large rolls, split
1 (5.2 ounce) package Boursin Garlic & Fine Herbs cheese
Lettuce, tomato, and avocado slices
12 cooked bacon slices