Paninis are grilled sandwiches, from what I gather, anyway Two slices of bread (Italian white) buttered, toppings in between the slices of bread (provolone cheese, white meat chicken, grilled red and green peppers, grilled onions, some sort of Italian sauce for this one). You grill the sandwich and there's your panini ^^

With the frozen paninis I got at the store, they come in a box with this grilling tray thing...it's basically cardboard with something in it that grills the bread as it cooks in the microwave. SO YUMMY