This recipe uses a panini press as its primary tool with alternatives covered:
The Panini Press (Ideal Equipment)
A panini press or panini maker creates the specific result this recipe is designed for compressed, golden, crispy exterior with a hot, melted interior. The top plate applies even pressure from above while the ridged or flat heated plates below create golden marks and crispness simultaneously.
Breville Panini Press - IMO the best consumer-available option. Consistent temperature, even pressure, excellent crust development. If you make panini regularly, this is worth owning.
George Foreman Grill - widely owned, works very well as a panini press. The ridged plates leave more pronounced grill marks but produce excellent crispness and good cheese melting.
Hamilton Beach Panini Press - affordable, reliable, good for occasional use.
Alternatives If You Don't Own a Panini Press
Cast iron skillet + heavy object -Heat a cast iron skillet over medium heat. Place the assembled sandwich in the pan. Set another heavy pan, a cast iron skillet, or a weighted pot on top of the sandwich. Cook 2–3 minutes per side, pressing down with the weight. This produces a slightly less evenly pressed result but works well.
Toaster oven or oven broiler- Open-faced version spread pesto on one slice, layer tomato and mozzarella on top, and broil at high for 3–4 minutes until the cheese melts and edges begin to crisp. Less pressed but equally delicious.
Regular toaster- Toast both bread slices first, then assemble cold with room-temperature mozzarella and tomato, and skip the pressing step. The result is a fresh, unheated caprese toast rather than a pressed panini genuinely good but different in character.