Crab Cakes with Tartar Sauce

Name: Crab Cakes with Tartar Sauce
Ingredients: 3/4 cup mayonnaise; 2 tablespoons minced cornichons (about 3 large) plus 2 teaspoons cornichon brine; 2 teaspoons finely chopped fresh parsley; 1 1/2 teaspoons finely chopped fresh tarragon; 1 tablespoon minced scallion; 1 tablespoon minced shallot; 1 1/2 pounds jumbo lump crabmeat, picked over to remove any cartilage or shell; 8 scallions, green part only, minced (about 1/2 cup); 6 tablespoons mayonnaise; 2 teaspoons seafood seasoning, such as Old Bay; 1 1/2 tablespoons chopped fresh parsley; 4 to 6 tablespoons plain dry breadcrumbs; Kosher salt; Freshly ground white pepper; 2 large eggs, lightly beaten; 6 tablespoons all-purpose flour; 4 tablespoons vegetable oil