Step 1: Prepare the Fish: Gently flake the cooked white fish with a fork, ensuring to remove any remaining bones. Avoid over-shredding; the salad benefits from having discernible pieces of fish.
Step 2: Combine Ingredients: In a medium bowl, combine the flaked fish, mayonnaise, diced celery, red onion, lemon juice, dill, Dijon mustard, and white pepper.
Step 3: Mix Gently: Carefully fold all the ingredients together until well combined, being mindful not to overmix. Overmixing can result in a paste-like consistency.
Step 4: Season and Adjust: Taste and adjust the seasoning with salt as needed. If a tangier flavor is desired, add a bit more lemon juice.
Step 5: Chill and Serve: Cover the bowl and refrigerate for at least 30 minutes to allow the flavors to meld. Serve chilled with crackers, toast, bagels, or as a sandwich filling.
Optional tip: For a smoky flavor, add 2 ounces of smoked white fish along with the cooked white fish. Alternatively, substitute sour cream or Greek yogurt for half of the mayonnaise for a lighter, tangier version.