Portabello Pesto Burgers | Paula Deen

Ingredients

• 4 portobello mushroom caps, about ¾ pound
• ¼ cup Olive oil
• 1 teaspoon salt
• 1 teaspoon Freshly ground black pepper
• 3 pounds ground beef
• 1 cup prepared pesto or homemade pesto (recipe follows)
• 8 hamburger buns
• 6 ounces mozzarella cheese
• 4 ounces fresh basil
• ¾ cup extra-virgin olive oil
• ½ cup pine nuts
• 2 garlic cloves
• ½ teaspoon salt