Golden polenta with rivers of melted cheese is alpine comfort food at its simplest. This vegetarian mediterranean dish is a rich, family-friendly meal from Italy's northern mountain regions.
In a heavy saucepan, combine whole milk and water. Bring to a gentle simmer over medium-low heat, stirring occasionally to prevent scorching.
Gradually whisk in yellow cornmeal in a steady stream, stirring constantly to avoid lumps. Lower the heat as soon as bubbles appear.
Add kosher salt, black pepper, and nutmeg. Keep stirring until polenta thickens, about 25–30 minutes, adjusting heat to prevent sticking.
When polenta is fully thickened and smooth, stir in unsalted butter until melted and glossy.
Immediately transfer the polenta to a warmed serving dish. Scatter fontina and mozzarella cheese over the hot polenta, allowing it to melt and form rivers of gooey cheese. Serve hot while cheese is perfectly melted.