Balsamic Caramelized Onions for Burgers

Burger with Caramelized Onions, Uploaded from the Photobucket iPhone AppFood shows often feature restaurants or diners serving up special burgers, sometimes with caramelized onions.  I'd never tasted one until a local restaurant recently served a gourmet-delicious onion mixture on my burger with blue cheese.

My daughter and I tried to figure out what ingredients the chef must have used and decided on the ingredients for this recipe.

I'd caramelized onions for French onion soup before, so experimented by adding tastes experienced, and it turned out as delightful or better than the restaurant!
Balsamic Caramelized Onions for Burgers
1 medium onion cut in half, sliced 1/4 inch thick
2 Tabs. of butter
2 Tabs. olive oil
1/2 tsp.salt
1 tsp. sugar
Uploaded from the Photobucket iPhone App1/3 cup chopped tomatoes (fresh, sun-dried or salsa)
1/3 cup chopped bacon, (2 or 3 strips)
4 Tabs. balsamic vinegar
Blue cheese and lettuce for toppings
Caramelized Onions, Uploaded from the Photobucket iPhone App

In a 10-inch skillet melt butter with oil on medium heat and let onions cook slowly until translucent, and light golden brown, about 15-20 minutes, turning occasionally.

Add salt, sugar, tomatoes and bacon, and continue cooking until all looks nicely browned and caramelized, about 10 more minutes.  Add balsamic vinegar, cooking and stirring ingredients until vinegar and any juices reduce.

Keep warm until ready to use.  As a time saver, double or triple the batch and keep refrigerated in a jar, or freeze to have on hand anytime for burgers.  I used leftovers the next night to stuff chicken breasts with blue cheese.
Uploaded from the Photobucket iPhone App
Our burgers came on a fresh-toasted bun with melted blue cheese on the burger, then topped with a layer of the caramelized onions and butter lettuce.  I added a seasoned mayo mixture on my homemade buns.

Caramelized Onion Burger, Uploaded from the Photobucket iPhone AppSeason and shape 4-5 oz. of ground beef:  round, flat, and about 1/2 inch thick. Make an indentation in the middle with back of spoon, and fry on medium-high heat for 5 minutes on each side, turning just once.

The indentation helps keep burgers flat, preventing them from swelling in the middle while cooking.  During last few minutes, put cheese on top to soften and melt.  Assemble burgers and enjoy!
Recipe is ample for 4-6 burgers.

Estimated cost: for extra-lean ground beef (85%)  burger, bun, and toppings $1.50 each or less.

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