Start with the chicken. If you're cooking it from scratch, poach or grill chicken breasts until fully cooked. Let them cool completely before dicing. For a true chicken salad experience, ensure the chicken is cut into small, uniform pieces.
In a large mixing bowl, combine the mayonnaise, sweet relish, Dijon mustard, salt, and pepper. Whisk until smooth. This creates the creamy base that's essential to a great chicken salad.
Add the diced celery and finely chopped onion to the mayo mixture. These veggies add a delightful crunch and subtle flavor that complements the chicken perfectly.
Gently fold in the diced chicken, ensuring each piece is evenly coated with the dressing. Be careful not to overmix, as you want to maintain the chicken's texture.
If you're using the lemon zest (my special twist on the classic Publix chicken salad recipe), sprinkle it over the mixture and fold it in gently. The citrus adds a bright, fresh note that elevates the entire dish.
Cover the bowl with plastic wrap and refrigerate for at least an hour before serving. This allows the flavors to meld and the chicken to absorb the creamy dressing.