Cut squash in half, and discard seeds. Place the squash halves, cut sides down, in a 13 x 9-inch glass or ceramic baking dish, and add 1/2 cup water to dish. Cover and bake at 450° for 40 minutes or until squash is tender. Remove the squash from pan, and let stand for 10 minutes. Remove pulp from skin, and discard skin. Combine squash pulp, 1/2 cup brown sugar, and the remaining ingredients in a food processor, and process until smooth.