For an extra nutty flavor, toast the sesame seeds in a dry skillet over medium heat until lightly golden before adding them to the dressing. Be careful not to burn them! Feel free to substitute other citrus fruits like clementines or tangerines for the mandarin oranges. If you prefer a milder flavor, reduce the amount of crushed red pepper or omit it altogether. This salad is best served immediately, but the chicken can be prepared ahead of time and stored in the refrigerator for up to 2 days.