Lightly butter the 2 slices of bread on both sides.
Grate the tomato into a large bowl, discard the leftover peel.
Thinly slice the mushrooms, pan-fry over a high heat with a knob of butter and splash of olive oil until golden and set aside.
Add the garlic and olive oil to the grated tomato and season well.
Spread the grated cheese on one slice of bread.
Top with the tomato mixture, and mushrooms and close the sandwich.
Wrap the sandwich in the slices of jamon.
Place sage leaves on top of the sandwich and place the toastie in a preheated press.
Cook for 5 minutes or until the sage leaves and jamon are crisp and the cheese is melted.
Leave to cool for 5 minutes before eating.