Grilled Portabella Mushrooms with Herb Infusion

Ingredients

• 6 medium portabella mushrooms, stems removed and wiped clean
• 1 teaspoon fresh rosemary or ½ dried rosemary
• 3 tablespoons extra virgin olive oil
• 3 tablespoons balsamic vinegar
• 1 teaspoon fresh thyme or ½ dried thyme
• 2 garlic cloves, thinly sliced
• Salt and pepper, to taste