For a richer flavor, use Greek yogurt instead of plain yogurt. If you prefer, you can briefly blanch the spinach in boiling water for 30 seconds, then immediately transfer it to an ice bath to stop the cooking process. This will soften the spinach and mellow its flavor. Consider adding toasted nuts, such as almonds or walnuts, for added crunch and nutritional value. A squeeze of lemon juice can brighten the flavors of the salad. Feel free to adjust the amount of sugar and red pepper flakes to suit your taste preferences.