Why settle for ordinary grilled cheese when this is so easy to fix?
Split a 4-inch piece focaccia; spread pesto on the cut sides. Sandwich with fresh mozzarella and baby arugula. Preheat a nonstock skillet over medium-low heat; lightly brush with olive oil. Add the sandwich and top with a heavy skillet. Cook until golden brown and the cheese melts, 3 to 4 minutes per side.
Recipe and Photo Courtesy of Food Network Magazine.