Salmon Burgers with Dill Tartar Sauce

Name: Salmon Burgers with Dill Tartar Sauce
Yield: Makes 2 Servings
Ingredients: 10 ounces skinless salmon fillet, cut into 1-inch pieces; 3 tablespoons plus 1/2 cup purchased tartar sauce; 2 tablespoons chopped fresh dill; 1/4 teaspoon salt; 1/4 teaspoon ground black pepper; 1 teaspoon grated lemon peel; 2 sesame-seed rolls, split; Red onion slices; 4 Bibb lettuce leaves