Smorgastarta - Swedish Sandwich Torte

Ingredients

• 2/3 cup sour cream
• 1 teaspoon lemon zest , finely grated
• 2 teaspoons lemon juice
• 6 large hard-boiled eggs , finely chopped
• 1/4 cup fresh dill , chopped
• 1 tablespoon red onion , finely chopped
• 2 teaspoons rinsed capers , finely chopped
• 4 ounces smoked trout , skin removed , shredded
• 1/3 cup celery , finely chopped
• 2 teaspoons parsley , finely chopped
• 1/2 teaspoon caraway seed
• fresh ground pepper , to taste
• 12 slices whole wheat bread or 12 slices rye bread , lightly toasted