Succulent and juicy with a layer of crisp crackling, it is impossible to resist the siren call of freshly roasted porchetta. Though the dish has since spread throughout the country, it originated from central Italy, where it is ubiquitous in butcher's shops, and commonly sold on the streets. During holiday fairs and festivals, large crowds of people will queue in front of food trucks for a porchetta panino, or bring porchetta slices along for a summer picnic.