Lightly grease your BBQ. In a bowl mix together the red wine vinegar, balsamic reduction, olive oil, garlic, herbs and salt and pepper. Marinate mushrooms in this mixture for 10 - 15 min.
Thread mushrooms onto skewers and BBQ on medium heat for 5 min. per side for a total of 10 min. Brush with residual marinade while BBQing.
Nutrition calculation is an estimation only. If you need nutritional calculations for medical reasons, please use a source that you trust.