Spread pesto thinly over the inner face of each bread slice.

Divide half the mozzarella over 2 slices, add one flat layer of dry pepper strips and top with remaining mozzarella. Close the sandwiches.

Spread mayonnaise over the outside faces and heat a large skillet over medium-low heat.

Cook for 4 to 5 minutes per side, covering for 2 minutes after turning, until the bread is golden and mozzarella is fully melted.

Rest for 1 minute and cut each sandwich in half before serving.