I love this recipe for Pan Roasted Brussels Sprouts dressed with Pickled Raisins and Black Walnuts in a Balsamic Reduction.
you can make the vinegar reduction up to 3 days ahead of time and store in the refrigerator. To warm it up just pour it into a small sauce pan, set it over a very low temperature burner, stirring occasionally until warmed through, be sure you don't reduce it more or burn it.