For a richer flavor, try using balsamic vinegar instead of lime juice in the dressing. Add toasted nuts like walnuts or pecans for extra crunch and a nutty flavor. Feel free to add other roasted vegetables such as sweet potatoes or carrots to the salad for added variety. If you don't have Dijon mustard, a touch of whole-grain mustard will also work well. For a spicier kick, add a pinch of red pepper flakes to the dressing.