1. Combine first 8 ingredients in a bowl. Gently fold crabmeat into mayonnaise mixture. Cover and chill 30 minutes or several hours.
2. Stir egg and 1/3 cup panko into crabmeat mixture. Shape mixture into 20 (1 1/2-inch) patties. Dredge in remaining panko.
3. Cook crab cakes, in batches, in hot oil in a large nonstick skillet over medium-high heat 2 minutes on each side or until golden. Serve with Ginger Aïoli.