For each sandwich:
Butter the bread on one side of each slice, and spread mustard on one slice. Layer cheese, turkey and one layer of pear on top of the mustard spread side of bread and top with another slice. Buttered sides of the bread should be facing out. Toast in a frying pan, sandwich press or non-stick grill. If toasting in a pan, place something on top of the sandwich to weigh it down such as baking sheet or a heavy frying pan. Cook until golden brown and cheese melts. Let cool slightly before cutting in half and serving.