This is a great tasting chicken dish. If you don't have balsamic, use red wine vinegar. Can substitute any chicken part for the whole chicken mentioned in the recipe. I have even used boneless chicken breasts and baked at 350 for 50 minutes and that worked well. If the chicken gets a nice golden brown, you may not need to broil it. As usual, fresh rosemary works best. I use a bit less olive oil as well, use your judgement. The original recipe calls for 3 slices of pancetta atop each chicken half, but I don't think it added much to the final dish, you could subsitute bacon if desired. This is adapted from Bon Appetit, 1997. Hope you enjoy!