What a disappointment!  Way too sweet.  It was a NYT recipe and I chose it over another recipe that was being reviewed as being too acidic.  It only has 4T of balsamic in it, 6 garlic cloves, herbs and chicken broth. I didn't use a cheap balsamic (perhaps not the most expensive either, but still).  I salvaged it in reheating by adding a liberal squeeze of lemon juice.  Is more expensive vinegar what I needed?