Smoked Fish Salad

Chop fish finely. Peel potatoes and chop finely. Quarter and core apple, dice into cubes and sprinkle with lemon juice, combine with potatoes and fish. Peel onions and chop finely. Cut bacon into cubes. Heat 2 tablespoons of butter 3 tablespoons of oil in a pan and cook bacon for a few minutes. Add onions and saute briefly. Deglaze pan with vinegar and apple juice and season with sugar, salt and pepper. Pour over the salad. Rinse herbs, shake dry and pluck off leaves, chop and sprinkle over the salad, mix well. Whisk remaining butter until fluffy and mix with horseradish. Season butter with salt and pepper to taste. Serve salad with bread and horseradish butter.