For the rosemary balsamic glaze: Heat the olive oil in a small saucepan over medium-high heat. Add the garlic and cook for one minute, until fragrant. Add the balsamic vinegar, red wine, brown sugar and the rosemary sprigs and bring to a rapid boil. Reduce the heat and simmer uncovered for 5 minutes. Add the broth, return to a boil, reduce the heat to low and simmer for another 15 minutes. Discard the rosemary sprigs.