Combine first 7 ingredients. Add 1/3 cup panko and crab; toss gently. Divide the crab mixture into 8 equal portions; shape each into a 3/4-inch-thick patty. Place remaining panko in a shallow dish. Gently dredge patties in panko.
Heat a large skillet over medium-high heat. Add 1 tablespoon oil to pan. Add 4 crab cakes to pan; cook 4 minutes on each side. Remove from pan; keep warm. Repeat procedure with remaining oil and crab cakes.
Combine 2 tablespoons mayonnaise and remaining ingredients; serve with crab cakes.
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