Place two slices of bread in the frying pan (or 4 if your pan is large enough) with the heat OFF. Spread with butter, then flip so they are butter side down.

Top with 3-4 thin slices mozzarella, followed by 1 heaped tbsp pesto, topped with sun dried tomatoes and bacon, followed by another layer of mozzarella then finish with another slice of bread.

Squish down with your hands to contain the filling, then spread with butter.

Turn heat to medium and fry both sides until golden with the cheese melted through the center.