Cut the onion into small cubes. Pour into a bowl, sprinkle with lemon juice and pour boiling water. A slice of lemon is also sent to a bowl. Leave it on for 10 minutes.
Cut the potatoes into cubes. Pour into a deep bowl.
Peel the apple, remove the core and cut into small cubes. We send it to a bowl with potatoes.
Cut the herring fillet into small cubes. Pour into a bowl with the rest of the ingredients.
Drain the water, remove the lemon slice and put the onion in a bowl. Cut the eggs into halves and carefully remove the yolk. Cut the yolk into cubes and also send it to a bowl. Pepper and salt to taste.
Last of all, add finely chopped dill and sour cream.