Potato herring salad
Ingredients:
500 gr  cooked potatoes
some gherkins
6 Amsterdam (yellow) onions
2 - 4 tablespoons gherkin vinegar
pepper and salt
3 salt or sour herrings
1 sour apple
(1 green bell pepper)
2 cooked beets
Sauce:
4 tablespoons yogurt, 2 tablespoons lettuce sauce, 
 1 à 2 tablespoons grated horseradish, salt, freshly ground pepper, 
 sugar, 1 teaspoon dill seed .
Cut the cooled potatoes in cubes and chop gherkins and onions.
Mix in a bowl. Sprinkle with the gherkin vinegar. 
 Let rest for a couple of minutes.
Cut the herring in strips. Grate the apple on a big hole grater. 
 (Half the bell pepper lengthwise. Remove the seeds and chop 
 the bell pepper.)
Cube the beets. Mix everything with the potatoes.
Sauce:
Stir the thin yogurt with the lettuce sauce smooth and make 
 a tasty sauce by adding horseradish, salt, pepper, a pinch sugar 
 and fresh dill seeds.
Fold the sauce carefully into the herring salad.
Let the tastes mix at least an hour.