For the salad, heat one tablespoon of the oil in a large non-stick frying pan and fry the parma ham for one minute on each side, or until golden-brown. Remove from the pan and drain on kitchen paper.
In the same pan, heat the remaining oil, place the ciabatta slices into the pan and cook until golden-brown.
Place the spinach and tomato into a large bowl. Place the dressing ingredients into a small bowl, mix together well and pour over the salad. Mix well to combine.
Transfer the salad to a large plate and top with the croutons and parma ham.