Using your hands or a knife, break or cut the beef patties into pea-size pieces.
In a large straight-sided skillet, combine the pizza sauce, chicken stock, heavy cream, nutmeg and beef over medium-high heat. Season with just a bit of salt and a few grinds of black pepper. Bring to a simmer and cook until heated through, 2 to 3 minutes.
Meanwhile, cook the pasta in the boiling water according to the package directions. Drain, add to the sauce and grate some Parmesan over the top. Stir together until the cheese melts, then serve.