Crunchy celery with creamy avocado and walnuts for a clean, nutty bite. Bound with mayonnaise and lemon: fresh, smooth, and gently acidic. Texture leads: crunch, cream, and a dry finish.

Slice the celery into thin half-moons and place it in a bowl with water and ice for 8 minutes. This keeps it firm and crunchy, not fibrous or limp.
Drain the celery very well and dry it with paper towels. This step looks small, but it matters: wet celery loosens the mayonnaise and dulls the texture.
Cut the avocado into medium cubes and coat it with part of the key lime. Toss gently so it is covered without breaking; we want creaminess, not accidental guacamole.
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In a bowl, mix the mayonnaise, the remaining key lime, salt, and black pepper. It should taste creamy, tangy, and light; if it feels too heavy, the salad turns dense.
Combine the celery, avocado, toasted walnuts, and dressing with broad, gentle folds. Serve right away or chill for 5 minutes; it should feel crunchy, creamy, and finish dry with walnut.