Fish Cakes with Coleslaw and Horseradish Dill Sauce

Name: Fish Cakes with Coleslaw and Horseradish-Dill Sauce
Ingredients: 2 large lemons; 1 /2 cup mayonnaise; 1 /2 cup chopped green onions, divided; 2 tablespoons sweet pickle relish; 2 tablespoons prepared horseradish; 3 tablespoons chopped fresh dill, divided; 4 slices white sandwich bread, torn into pieces; 8 ounces mahi-mahi, cut into 8 strips; 1 large egg, lightly beaten; 1 8-ounce bag coleslaw mix; 2 tablespoons olive oil