Let me explain.
Sandwiches are generally divided into two categories: first, the sandwich - that is, bread and butter and cheese. This is a classic but quite ordinary. Second, the more exciting toastie. The main drawback here is that you really have to have a toastie maker.
There is, however, a third category. This is the Hot'n'Cold Sandwich.
The Hot'n'Cold Sandwich combines the best of both worlds. You make it by making some piping hot toast, buttering both pieces with soft butter so that it is gooey and "glumpshy" (sorry no better word). This is the "hot" part.
Then get your cheese out of the fridge and cut it in into slices and put it in. It must be cold. Make the sandwich as you would ordinarily do. Press together and cut in half.
This does not sound revolutionary, but it is.
The hot and cold element is crucial. And it is fantastic. If you have not got a toastie maker, or if you cannot be bothered to set it up, then this is the way to go.
The butter should ooze. You can't imagine it, so try it. It is the ultimate upgrade to the cheese sandwich. Add (cold) ham if feeling wild...