Grilled Portabella Mushroom Burgers a La Dave Recipe

Ingredients

• 4 large Portabella mushroom caps
• 4 tablespoons Olive oil
• 3 tablespoons Balsamic vinegar
• 2 minced Garlic cloves
• 2 tablespoons Soy sauce
• 1 teaspoon Smoked paprika
• 0.5 teaspoon Salt
• 0.5 teaspoon Black pepper
• 4 Burger buns
• 4 large Lettuce leaves
• 1 large Tomato
• 0.5 medium Red onion
• 4 slices Cheese slices (optional)
• 4 tablespoons Mayonnaise
• 4 teaspoons Dijon mustard