Spread 2 Slices Of Bread With The Mustard. Layer Each With 3 Slices Of Ham, Half Of The Pear Slices, A Dash Of Pepper, And 1/2 Cup Mozzarella Cheese. Top With Remaining Bread. Lightly Spread Margarine On The Outer Sides Of Each Sandwich. Heat A Skillet Or Griddle Over Medium Heat. Grill The Sandwiches Until The Cheese Is Melted And The Bread Is Golden Brown, About 3 Minutes Per Side. Cut Each Sandwich In Half To Serve.