Saltimbocca alla Romana (Veal, Prosciutto, Sage — Pan Sauce)

Saltimbocca alla Romana — 'jumps in the mouth' — is a dish of radical simplicity that requires precision of execution to achieve its defining character: a thin escalope of milk-fed veal, layered with a leaf of fresh sage and a slice of prosciutto di Parma, cooked prosciutto-side down in butter until the ham crisps and the veal is just barely cooked through, then finished with dry white wine or Marsala. It is one of Rome's most famous contributions to Italian cuisine and its virtues are inseparable from the quality of its ingredients. The dish's origins are disputed — some attribute it to Brescia in Lombardy, others to the Spanish influence during their occupation of Naples — but it is codified as Roman by Ada Boccaccio's 1900 recipe book and has been embedded in Roman trattoria culture ever since. The prosciutto must be a single, paper-thin slice — not folded or stacked — and the sage leaf must be fresh. The sage leaf is traditionally secured to the veal with a toothpick through the prosciutto, though some Roman cooks skip the toothpick and rely on the prosciutto's fat to adhere during cooking. Technique defines the dish. The veal is very lightly dusted with flour on the flesh side only — the prosciutto side is never floured — to encourage browning and to give the pan sauce something to bind against. Butter, foaming and clear, is the only cooking fat. The escalope goes in prosciutto-side down and is cooked undisturbed for 90 seconds — the prosciutto must render and crisp. A single flip, 30 seconds on the veal side, and it comes out. The pan is deglazed with white wine — a small amount, 50ml, which reduces to a few tablespoons — and swirled with a cold knob of butter to mount the sauce. The saltimbocca returns to the pan only to glaze, not to continue cooking.