Ingredients

  • 1/2 cup mashed potatoes (optional)
  • 1/2 cup sour cream
  • 1 tablespoon finely grated peeled fresh horseradish
  • 1 teaspoon chopped fresh dill
  • 1 teaspoon chopped fresh flat-leaf parsley
  • 1 teaspoon fresh lemon juice
  • Kosher salt, ground pepper
  • 4 slices Danish rye or pumpernickel bread
  • 8 ounces sliced smoked salmon
  • 2 radishes, thinly sliced
  • 2 tablespoons salmon or trout roe (optional)
  • Dill sprigs and flat-leaf parsley leaves
  • Kosher salt, ground pepper

Method

  • Whisk potatoes, if using, sour cream, horseradish, dill, parsley, and lemon juice in a small bowl; season with salt and pepper.
  • Spread horseradish sour cream on bread and top with smoked salmon, radishes, roe, if using, dill, and parsley. Season with pepper.