Pan-fried Caprese Sandwich

Slice the bread and spread a generous layer of pesto on the inside of both slices.

Layer the mozzarella slices and tomato slices on one piece of bread. If using, add a few arugula leaves or a drizzle of balsamic glaze now. Close the sandwich.

Lightly butter the outside of the bread slices.

Heat a non-stick pan over medium-low heat. Place the sandwich in the pan and cook for 3-4 minutes per side, or until the bread is golden brown and the cheese is melted.