Velvety melted Fontina cheese enriched with egg yolks and butter is Valle d'Aosta's communal fondue. A vegetarian high protein mediterranean dish ideal for family sharing on cold evenings.
Cut Fontina cheese into small cubes for even melting and soak in whole milk for at least 30 minutes to enhance creaminess.
Set a double boiler or heatproof bowl over gently simmering (not boiling) water and add soaked cheese and milk mixture; stir continuously with a wooden spoon.
Maintain medium-low heat, ensuring the water does not touch the bowl, and melt the cheese completely until smooth, about 8-10 minutes.
In a separate bowl, whisk the egg yolks gently; then gradually add to the melted cheese mix, whisking constantly to prevent curdling.
Add unsalted butter, salt, and pepper; stir and cook another 2-3 minutes on low heat until the mixture is velvety and thickened but still pourable. Serve immediately in a warmed dish.