Rome — 19th century street food tradition; directly linked to Testaccio neighbourhood food culture and Roman pizzerie fritti
Supplì al telefono are Rome's answer to the Sicilian arancino — fried rice croquettes filled with a ragù of meat and tomato and a cube of mozzarella that, when pulled apart while hot, stretches into long, phone-cord-like strings of molten cheese. The name translates as 'telephone croquettes,' and this visual drama — the melting mozzarella thread — is both the technical proof of successful execution and the dish's defining pleasure. Unlike the Sicilian arancino, which is built on saffron risotto, the supplì is made from a tomato-enriched rice cooked and cooled in its own ragu sauce, giving each grain a reddish hue and a deeper, meatier base. The rice is a medium-grain variety — not risotto rice specifically — cooked until slightly overdone so it becomes slightly stickier and holds its cylindrical shape more reliably. The filling — a small spoonful of bolognese-style ragù and a cube of fresh mozzarella — goes into the centre before the croquette is sealed. The shape is elongated and oval, approximately the size of a large egg, giving a better filling-to-crust ratio than the spherical arancino. The croquette is rolled in breadcrumbs, passed through beaten egg, and rolled again — a double coat that creates the characteristic thick, sturdy crust that shatters audibly when bitten. Frying at 175°C produces a deep amber exterior in about four minutes. Supplì are street food in Rome — sold in bars, pizzerie, and friggitorie as an antipasto or snack. They are consumed hot, in the hand, and the moment of pulling apart to see the cheese threads is participatory and joyful. The crust should crack crisply; the interior should be hot enough that steam escapes and the mozzarella is fully molten.
Crisp fried crust giving way to tomato-red rice and molten mozzarella — savoury, rich, and exuberantly satisfying
Cook the rice in tomato ragù rather than plain water — the rice must be flavoured before shaping Mozzarella must be fresh, well-drained, and cubed — moisture-logged cheese steams rather than melts cleanly Double coat in breadcrumbs — first roll, then egg, then roll again for a crust that resists frying rupture Fry at a consistent 175°C — the crust sets before the interior can expand and burst Serve immediately — supplì cools quickly and the mozzarella re-solidifies within minutes
Use a small amount of chicken liver in the ragù — traditional Roman supplì contain rigaglie (giblets) for additional depth Freeze shaped and crumbed supplì for 20 minutes before frying — they hold their shape better in the oil For a restaurant preparation, par-fry for 3 minutes and hold; finish for 90 seconds to order for perfect service temperature The mozzarella cube should be no larger than 1.5cm — too much cheese creates a wet interior that steams and makes the crust soggy Fleur de sel pressed onto the finished supplì immediately after frying elevates street food to restaurant-grade
Using plain cooked rice instead of rice cooked in tomato ragù — the flavour is entirely wrong Using low-moisture processed mozzarella instead of fresh — it does not produce the 'telephone' string effect Shaping before the rice has fully cooled — warm rice does not bind and falls apart in the oil Under-frying — a pale crust will be soft and the interior may not reach temperature for proper melting Frying too many at once — the temperature drops and the croquettes absorb oil rather than fry