To prepare the sandwich, spread mayonnaise and mustard on the bread. Then top with sliced ham and sliced cheese. We went with smoked cheddar, but you could use gouda, mozzarella or swiss. A cheese that melts nicely makes a good choice.

Close the sandwich and place a plate on top of the sandwich. Press the plate firmly onto the sandwich. You want to press the sandwich closed – so it doesn’t explode when you dip it.

In a wide, shallow bowl, whisk together the egg and milk. Use two hands to dip the sandwich into the egg bath. Carefully flip the sandwich to coat both sides in the egg.

In the meantime, melt the butter in a large skillet over medium-high heat. Transfer the dipped sandwich to the skillet. Let the sandwich fry for at least 3 minutes on each side. The amount of time will depend on the amount of cheese used – more cheese, means more time on the heat to melt.

Once the sandwich is beautifully golden, remove from the skillet, slice and serve.