In a food processor, pulse together cranberries and apple until coarsely chopped; transfer to a medium bowl. Peel orange and separate into segments, removing membrane. Coarsely chop segments and squeeze juice from membrane (discard membrane). Add orange, juice, zest, sugar, nuts, brandy (if using) and allspice to cranberry-apple mixture; stir until combined. Cover and refrigerate overnight. Serve chilled. Makes 12 to 14 servings.