1. Peel the celery ribs so they sit flat, then cut them on the diagonal into 1-inch lengths.
2. In a medium bowl, combine the softened cream cheese with the mayonnaise, lemon juice, basil, tarragon, parsley and lemon zest.
3. Add the crabmeat, peas, fennel bulb and onion and stir gently until just combined.
4. Season with salt and pepper. Spoon 1 teaspoon of the crab salad onto each piece of celery and garnish with a bit of fennel frond.