Crab Cocktail Americana

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1/2 cup mayonnaise

2 teaspoons ground mustard

1 teaspoon Worcestershire sauce

1/4 teaspoon finely grated lemon zest

1 pound jumbo crabmeat, picked through to remove any bits of shell and cartilage

2 medium Roma tomatoes, cored, seeded and chopped (about 2/3 cup)

1 firm, ripe avocado, diced

Kosher salt

4 to 6 small Boston lettuce leaves

Lemon wedges, for garnish