1. Whisk together the mayonnaise, mustard, Worcestershire and lemon zest in a medium bowl. Set aside half of the mustard sauce in a small bowl for topping the cocktail.
2. Gently toss the crab, 1/2 cup of the tomatoes and the avocado with the remaining sauce. Season with salt.
3. Arrange the lettuce leaves in 4 to 6 martini glasses. Spoon the crab salad on top. Garnish with a dollop of the reserved sauce, the remaining tomatoes and lemon wedges.
Recipe courtesy Food Network Kitchens
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