How to Make It
Turn on the broiler.
In a large bowl, combine the beef, pork, onion, egg, ⅓ cup half and half, bread crumbs, allspice, salt, and pepper. Using damp hands, roll mixture into 1-1 ½ inch balls.
Place the meatballs on foil-lined baking sheet and broil, turning once, until browned and cooked through, about 10 minutes. Remove from oven. Transfer the meatballs to a casserole dish and pour off the drippings into a small saucepan.
Place the small saucepan over medium low heat. Add the butter to the drippings. When the butter has melted, stir in the flour until it forms a paste. Cook, stirring constantly, until lightly browned—about 1 minute. Add remaining ⅓ cup half and half and bring to a simmer, still stirring constantly, for 3-5 minutes more, until the sauce is smooth and thick. Stir in beef broth to thin the sauce and season to taste with salt and pepper.
Pour sauce over meatballs and toss gently. Garnish with parsley. Serve hot with a bowl of chunky cranberry sauce on the side.