Grilled Portobello Mushroom Burgers with Glaze - Chopped

Ingredients

• 4 large portobello mushrooms stems removed
• 1/4 cup balsamic vinegar
• 2 Tbsp soy sauce
• 2 Tbsp olive oil
• 2 cloves garlic minced
• 1 tsp dried oregano
• 1/2 tsp salt
• 1/2 tsp black pepper
• 4 whole burger buns toasted
• 4 slices Swiss cheese (optional)
• 1 cup arugula
• 1 medium tomato sliced
• 1/4 cup burger sauce