Preheat your panini grill or a grill pan over medium heat.
One side of each slice of bread, if you prefer. Side Note: I always cook my paninis dry so they are extra crispy.
Place a little bit of mozzarella on top of one slice of bread. Add the tapenade to the top of the cheese, followed by the tomato slices and more cheese.
Place the other piece of bread on top.
Place on your panini pan (or grill pan).
Cook for 5 minutes or until crispy and golden brown on both sides.