Grilled Bruschetta Portobello Mushrooms

Bahan-bahan (6 porsi)

• 2 cups grape tomatoes (or cherry tomatoes, halved)
• 3 tablespoons red onion (finely chopped)
• 3 tablespoons fresh basil (shredded, divided)
• 1 pinch salt (to taste)
• 1 pinch pepper (to taste)
• 1 teaspoon dried oregano
• 6 portobello mushrooms (large, stem removed, washed and dried thoroughly with a paper towel)
• 1/4 cup balsamic vinegar
• 2 teaspoons brown sugar (optional)
• 1/4 cup butter
• 1 clove garlic (minced)
• 1 tablespoon fresh parsley (chopped)
• 1 pinch salt (to taste)