Preheat the broiler to high.

Heat a large pan over medium high heat. Add 2 tablespoons olive oil and swirl to coat the bottom of the pan. Add the bread slices and cook for 2 minutes on the first side or until golden brown and toasted. Flip the bread the cook for another 2 minutes to toast. Remove the bread to a plate. Add the remaining ½ tablespoon olive oil, tomatoes and salt to the pan. Cook until blistered and slightly browned. About 1 minute. Remove the pan from the heat. Push the tomatoes off to one side of the pan and arrange the toast back in the pan. Spoon the tomatoes on top of the toasts and dollop the pesto in between. Sprinkle evenly with the cheese and broil for 2 to 3 minutes or until golden brown and bubbly. Top with parmesan cheese if desired.