While the sauce is cooking, gently combine meatball ingredients in a large bowl being careful not to over mix. Divide meat mixture into 12 equal portions. Arrange in a glass baking dish. Bake for 20 minutes.
In a large skillet set over medium-low heat, heat the oil. Add the green onions, syrup, and cloves. Add ½ cup of blackberries. Cook for about 4 minutes or until the berries have disintegrated and the sauce is just slightly thickened. Stir in the vinegar, liqueur, and the remaining ½ cup berries. Remove from the heat.
In a small bowl, stir together the allspice, salt and pepper and sprinkle evenly over the chops. Broil chops in the heated pan, turning once halfway through the cooking, for 12 minutes or until barely pink in the center.