Mushroom Beef Burger with Basil Avocado Pesto - Patricia Bannan, MS, RDN

Ingredients

• 1/2 medium avocado
• 3 tablespoons walnuts
• 2 garlic cloves
• 4 cups fresh basil
• 4 tablespoons Parmesan cheese, grated
• 4 tablespoons water
• 1/2 medium lemon, juiced
• 2 tablespoons olive oil
• 1 3/4 lb white or crimini mushrooms, diced small
• 1/4 cup olive oil
• 1/8 teaspoon kosher salt
• 1/4 teaspoon ground black pepper
• 16 ounces beef or lamb, ground
• 8 ounces mushroom mixture
• 1/2 teaspoon ground black pepper
• 1/2 teaspoon Worcestershire sauce
• 1/2 cup fresh parsley, chopped
• 1 large egg
• 1 tablespoon olive oil (for the pan)
• 5 ounces fresh sliced mozzarella
• 5 whole wheat buns
• 5 tablespoons basil avocado pesto
• 2/3 cup caramelized onions
• 1 1/4 cups fresh baby arugula