Warming the balsamic vinaigrette for this salad has been one of my best ideas.
This vinaigrette pairs well with the earthy mushrooms and spinach. But, you can really mix most salads with this classic balsamic vinaigrette (maybe not warmed, though). This vinaigrette has a distinct flavor, certainly not overpowering. I warmed the dressing to wilt the spinach just a bit. Great. Idea.