1/2 pound ground pork, veal, turkey or chicken (or a mixture of all four)
1/2 small onion, minced
1 garlic clove, minced
Salt and freshly ground pepper
1/4 cup dry white wine
1/4 cup freshly grated Parmigiano-Reggiano cheese
1 ounce mortadella, finely chopped
1 ounce prosciutto, finely chopped
Pinch of freshly grated nutmeg
1 large egg, lightly beaten
In a skillet, melt the butter in the oil. Add the ground meat, onion and garlic and season with salt and pepper. Cook over moderate heat, stirring to break up lumps, until the meat is cooked and the onion is tender, 10 minutes. Add the wine and cook over moderately high heat until evaporated, 4 minutes.
Scrape the mixture into a food processor and pulse until the meat is finely chopped. Scrape the ravioli filling into a bowl and let cool. Stir in the Parmigiano, mortadella, prosciutto and nutmeg and season with salt and pepper. Stir in the beaten egg.
Ravioli can be prepared over two days. Mix the filling on day one, store it in the fridge overnight, then make the dough and assemble the ravioli the next day. Freeze for up to a month.