Tortellini Prosciutto E Piselli with sauce

18 ounces cheese tortellini 3 tablespoons olive oil 1 large onion , chopped 6 ounces prosciutto , chopped 2 tablespoons garlic , minced 1 teaspoon crushed red[...]

1 lb cheese tortellini 2 cups half-and-half 2 tablespoons flour 2 tablespoons butter 1 egg yolk 1 cup grated parmesan cheese 1 dash freshly-grated nutmeg 4[...]