Ingredients

• 4 thin pickled herring fillets (about 3/4-pound), cut into 1/2-inch pieces
• 1 small potato, peeled, boiled, cut into 1/4-inch cubes
• 1/4 cup finely chopped onion
• 2 tablespoons finely chopped dill pickle
• 1 small apple, peeled, cored, cut into 1/4-inch cubes
• 2 tablespoons mayonnaise
• Salt and freshly ground black pepper
• 1/2 stick butter, room temperature
• 6 thin slices black bread, halved
• Green leaf lettuce

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Instructions

1. Place herring pieces, potato, onion, pickle, apple and mayonnaise in a bowl and mix to combine. Add mayonnaise and mix well. Season to taste with salt and pepper.
2. Spread about 1 teaspoon of butter on each bread half. Top with a lettuce leaf, then with the herring mixture.