Hushpuppies

Name: Hushpuppies
Ingredients: 1/2 cup mayonnaise; 1/2 cup ketchup; 2 tablespoons chopped parsley; 1 cup stone-ground yellow cornmeal; 1/2 cup all-purpose flour; 2 tablespoons sugar; 1 1/4 teaspoon baking powder; 1 teaspoon baking soda; 1/2 teaspoon fine salt plus to taste; Pinch cayenne; 1 1/4 cup butter milk; 1 large egg, beaten; 2 scallions, finely chopped, plus more, sliced, for garnish; Vegetable oil for frying