Crab Cakes with Remoulade Sauce

Name: Crab Cakes with Remoulade Sauce
Ingredients: 1 tablespoon olive oil, plus more for frying; 1/2 medium yellow onion, minced; 2 teaspoons seafood seasoning, such as Old Bay; 1 garlic clove, minced; 1 pound jumbo lump crab meat; 3 tablespoons mayonnaise; 2 tablespoons minced fresh parsley; 2 teaspoons Dijon mustard; 1 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 2 slices bread, crusts removed, toasted and chopped into tiny pieces; 1 large egg, lightly beaten; Zest of 1 lemon; Mixed salad greens, for serving; Remoulade Sauce, recipe follows; 1/3 cup mayonnaise; 1 tablespoon ketchup; 1 tablespoon capers, chopped; 1 tablespoon sweet pickle relish; Juice of 1/2 lemon; Kosher salt and freshly ground black pepper