To freeze and reheat: Assemble the sandwiches as instructed, but omit the guacamole since it doesn’t freeze well. Once the sandwiches are completely cool, wrap each one tightly in foil, waxed paper, or plastic wrap. Place the wrapped sandwiches in a zip-top freezer bag or airtight container and freeze for up to 2 months.
To reheat, thaw overnight in the refrigerator. Warm in a 350°F oven or microwave until heated through.