Balsamic Drizzled Caprese Panini

In a small pot over medium heat, bring the balsamic vinegar and honey to a simmer, then reduce heat to medium-low and continue to simmer until the mixture is reduced by half. Remove from heat and let it cool.

Spread 1 tablespoon of pesto onto one side of each slice of bread.

On two slices of bread, equally divide and layer the arugula, fresh mozzarella, and tomato slices. Season with salt and pepper to taste.

Drizzle the balsamic glaze over the tomato slices and top with the remaining bread slices, pesto side down.

Spread 1 tablespoon of softened butter on the outside of each sandwich.

Heat a panini grill or grill pan over medium heat. Grill the sandwiches until golden brown and the cheese is melted, about 3-4 minutes per side.

Remove the sandwiches from the heat, let them rest for a minute, then slice and serve.