The perfect accompaniment for meat or poultry.  1 cup water or chicken broth  3/4 cup quick-cooking couscous, uncooked  1/2 cup dried tart cherries  1/2 cup coarsely chopped carrots  1/2 cup chopped unpeeled cucumber  1/4 cup sliced green onions  1/4 cup toasted pine nuts or slivered almonds (optional)  3 tablespoons balsamic vinegar  1 tablespoon olive oil...