Gather ingredients. Start by collecting all your ingredients—fresh lump crab meat, celery, red onion, and your choice of dill or parsley.

Mix the salad. In a mixing bowl, combine the crab meat, finely chopped celery, red onion, and your choice of dill or parsley. Give it a gentle toss.

Prepare the dressing. In a separate bowl, whisk together the mayonnaise, Dijon mustard, freshly squeezed lemon juice, salt, and pepper until smooth.

Fold gently. Carefully fold the dressing into the crab mixture, ensuring everything is well combined without breaking apart the crab.

Chill. Adjust your seasoning to taste, then pop the salad in the refrigerator for at least 30 minutes.