Storage: Leftovers keep in an airtight container in the fridge for up to 4 days. Reheat in the oven at 350°F for best texture.
Freezing: Wrap squares in foil, freeze up to 2 months. Reheat directly from frozen.
Customization: Try different meats (mortadella, capicola), cheeses (fontina, asiago), or swap in olives for the pepperoncini.