Portobello Burgers with Gouda and Roasted Garlic Recipe | Say Mmm

Ingredients

• 4 English muffins (light multigrain are our favorites)
• 4 portobello mushroom caps
• 2 heads of garlic
• 1 tablespoon olive oil
• 4 thick slices of gouda cheese
• 1 small red onion
• 1 medium tomato, sliced
• 1 avocado, sliced
• butter lettuce for garnish
• 1/2 cup balsamic vinegar
• 1/3 cup olive oil
• 2 tablespoons soy sauce
• 2 tablespoons cooking sherry
• 2 tablespoons balsamic vinegar
• 1 garlic clove, minced