These sandwiches are great as a melt too! If you want to make this into a melt sandwich, turn your broiler on high and melt the mozzarella cheese onto the dry top half of the sandwich bread for 2-3 minutes. Assemble the rest of the sandwich per directions.
If I'm serving these with fries, I'll double the pesto mayo and serve extra on the side as a dipping sauce for the potato wedges