Heat your pan up and place 3 large tbsp of butter and allow to melt and coat the bottom of the pan
Place two slices of bread on the pan
On one slice place your ham, cheese and mayo
Now the slice that doesn’t have cheese place on top of the one that does
Now place more cheese on the top of the sandwich
To the side of the sandwich add more butter as the previous slice would have soaked that up
Now flip the sandwich over and again place cheese on this side.
Toast this slowly on a nice medium heat
Keep flipping every 3-4 minutes until the cheese has melted and become slightly crispy
Slice and enjoy.