Fonduta piemontese is Piedmont's noble cheese fondue—a silky, golden emulsion of Fontina d'Aosta cheese, milk, butter, and egg yolks that is simultaneously one of the simplest and most technically demanding preparations in the Piedmontese repertoire. Unlike Swiss fondue (which uses Gruyère and wine), Piedmontese fonduta relies exclusively on Fontina DOP from the neighbouring Valle d'Aosta—a semi-soft, washed-rind alpine cheese with a distinctly nutty, slightly herbaceous flavour and a supple texture that melts into incomparable creaminess. The preparation begins by cubing the Fontina and soaking it in cold milk for 4-6 hours (or overnight), which softens the cheese and begins the flavour exchange. The soaked cheese and milk are then heated very gently in a double boiler (bagnomaria), stirring constantly with a wooden spoon, until the cheese melts completely into a smooth, homogeneous cream. Egg yolks and butter are incorporated off the heat, the residual warmth cooking the yolks to a velvety custard consistency without scrambling them. The finished fonduta should be perfectly smooth, pourable, and glossy—any graininess or separation indicates the heat was too high or the stirring too infrequent. The canonical serving is over toasted bread, polenta, or as a sauce for gnocchi, with shaved white truffle (during season) transforming it from wonderful to transcendent. Fonduta also fills vol-au-vent pastry cases and serves as the centrepiece of a fondue pot at the table. The egg yolks are what distinguish Piedmontese fonduta from Swiss fondue—they add richness, colour, and that distinctive custard-like body. The technique demands patience and a light hand: rush the melting or overheat the mixture and the cheese breaks into an oily, grainy mess.
Soak cubed Fontina DOP in milk for 4-6 hours. Melt gently in a bagnomaria, stirring constantly. Add egg yolks and butter off the heat. Must be perfectly smooth and pourable. Serve over toast, polenta, or with white truffle.
The cheese-to-milk ratio is roughly 400g Fontina to 250ml milk for 4 servings. The bagnomaria temperature should never exceed 70°C. Stir in a figure-eight pattern for even heat distribution. A tablespoon of flour whisked into the egg yolks acts as insurance against separation. During truffle season, this is the ultimate white truffle vehicle.
Using non-Fontina cheese (wrong flavour and melting properties). Heating too quickly (cheese breaks and becomes grainy). Not soaking the cheese beforehand. Scrambling the egg yolks. Over-heating after adding yolks. Using insufficient butter.
Giovanni Goria, La Cucina del Piemonte; Claudia Roden, The Food of Italy