Toast pine nuts
in a skillet over medium heat until fragrant, about 5 minutes. Combine pesto
ingredients in a food processor
until well combined but still rough-textured. If you have a panini press, turn it on to warm up; otherwise, set a cast iron skillet over medium heat. Assemble sandwich by smearing insides of bread slices with pesto. Arrange a layer of sliced tomato and season with a few turns of fresh pepper. Layer the mozzarella slices over the top and then place another piece of bread on top to make the sandwich. Drizzle
olive oil over skillet's surface and place sandwiches on the hot skillet or panini
press. If using a skillet, place another heavy skillet over the top to form a "press". Turn after 2 to 3 minutes and replace weight. The sandwich is ready when golden brown and mozzarella
has melted around the edges.