For an extra layer of flavor, consider adding toasted pine nuts or crumbled feta cheese just before serving. Blanching the red onion helps to mellow its sharpness, but if you prefer a more intense flavor, you can skip this step. Be sure to slice the red onion very thinly. Use the best quality extra virgin olive oil you can find; it makes a big difference in the overall flavor of the salad. Taste and adjust the seasoning as needed, adding more lemon juice, salt, or pepper to your preference.