Shrimp Cocktail Burger
Ingredients 1 1/2 pounds shrimp, peeled, deveined, and coarsely chopped (about 1/4 inch-pieces) 1 large egg, beaten 2 tablespoons mayonnaise 3/4 cup panko breadcrumbs 2 scallions, finely chopped 2 teaspoons Old Bay seasoning Kosher salt Finely grated zest of 1 lemon, plus 1 teaspoon fresh juice 1/4 cup ketchup 2 tablespoons prepared horseradish 1 tablespoon vegetable oil 4 brioche buns, split and toasted 2 cups shredded iceberg lettuce, for serving...