YUM! the zing that is added by the tiny bit of sugar plus vinegar & reduced broth really makes this dish flavorful. i made it exactly as written twice, then i eliminated ALL the butter, instead spraying the onions with a little olive oil spray before roasting. we didn't notice a measurable difference in flavor, altho 600 calories were missing. this is going to have a permanent place in the veggie rotation at our house!
I made this exactly as suggested except that I forgot to put the butter on top of the onions (oops!) But they were great anyway. It had rave reviews! Thanks for a great recipe