Casserole Bakso Swedia

Bahan-bahan (6 porsi)

• 10 ounces rotini pasta, (cooked and drained)
• 26 ounces frozen meatballs, (precooked)
• 4 tablespoons butter
• 3 tablespoons flour
• 2 cups beef broth
• 1 cup heavy cream
• 1 tablespoon Worcestershire sauce
• 1 teaspoon Dijon mustard
• ⅛ teaspoon allspice
• ⅛ teaspoon nutmeg
• ¼ teaspoon salt (or to taste)
• pepper to taste