Scandinavian Shrimp and Cucumber Sandwich

Name: Scandinavian Shrimp-and-Cucumber Sandwich
Ingredients: 1 pound peeled, deveined medium shrimp; ½ cup thinly sliced red onion; 3 tablespoons fresh lemon juice, plus 2 teaspoons grated lemon zest; 2 tablespoons rinsed capers; ¼ cup extra-virgin olive oil; Kosher salt and freshly ground pepper; 1 cup thinly sliced English cucumber; 2 packed tablespoons chopped fresh dill; ½ cup Neufchatel; 4 slices pumpernickel sandwich bread, lightly toasted; 4 hard-cooked eggs, sliced