1. To prepare crab cakes, combine first 6 ingredients (through egg) in a medium bowl, stirring well with a whisk. Stir in panko. Add crabmeat; stir gently to combine. Let mixture stand for 10 minutes.
2. Divide crab mixture into 8 equal portions; gently shape each portion into a 3/4-inch-thick patty. Heat a large nonstick skillet over medium-high heat. Add 1 1/2 tablespoons canola oil to pan; swirl to coat. Add 4 patties to pan; cook 3 to 4 minutes on each side or until golden. Remove patties from pan; keep warm. Repeat procedure with remaining 1 1/2 tablespoons canola oil and remaining 4 patties.
3. To prepare dressing, combine buttermilk and next 4 ingredients (through garlic), stirring with a whisk. Stir in 1 1/2 teaspoons chives, 3/4 teaspoon parsley, and 1/2 teaspoon dill. Arrange lettuce leaves on a platter; top with crab cakes. Spoon dressing over crab cakes; sprinkle with remaining 1 1/2 teaspoons chives, remaining 3/4 teaspoon parsley, and remaining 1/2 teaspoon dill.
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