Cup of Yum
1. Prepare the Basil Pesto: In a food processor, combine the basil leaves, pine nuts, Parmesan cheese, and minced garlic.
2. Pulse until the ingredients are finely chopped.
3. With the food processor running, slowly drizzle in the olive oil until the pesto reaches your desired consistency.
4. Season with salt and pepper to taste. Set aside.
5. Assemble the Sandwiches: Preheat a panini press or grill pan over medium heat. Take each slice of bread and spread a generous amount of basil pesto on one side.
6. On 4 slices of bread, layer the buffalo mozzarella slices evenly. Top the mozzarella with slices of tomato and a sprinkle of flaky sea salt or kosher salt. Add a handful of baby arugula on top of the tomato slices.
7. Drizzle balsamic vinegar or balsamic glaze (if using) over the arugula.
8. Place the remaining slices of bread pesto side down on top of each sandwich to close them.

Grill the Sandwiches (this is optional you can enjoy as is from steps above):

Cup of Yum
1. Brush the outer sides of each sandwich with olive oil.
2. Place the sandwiches on the preheated panini press or grill pan.
3. Grill for 3-4 minutes or until the bread is toasted and the cheese is melted.
4. If using a grill pan, press the sandwiches down with a spatula while cooking to flatten them slightly.
5. Once done and golden brown, remove the sandwiches from the heat and let them cool for a minute before serving.
6. Serve: Cut each sandwich in half diagonally. Serve warm and enjoy the delicious flavors of the Caprese sandwich with basil pesto!