In a bowl, mix the breadcrumbs and milk; let stand a few minutes until milk is absorbed. Add the beef, pork, 1 Tsp. salt, allspice, ginger, onion, an egg and mix until blended. Shape mixture into balls about 1 inch in diameter. Bring 2 quarts of water to a boil in a large saucepan and add 2 Tsp. of salt. Drop the meatballs into the water and simmer, covered, for 15 minutes. In the meantime, preheat the oven to 350 degrees. In a small saucepan, combine the brown sugar, broth, and melted butter; stir and heat until the brown sugar dissolves to form a glaze. Drain the meatballs and place in a single layer in a 13x9 baking dish. Spoon the glaze over the meatballs and bake uncovered for 30 minutes, turning the meatballs by shaking the pan after each 10 minutes of baking.