Piccadili salad

Wash the potatoes, boil in a uniform, cool, peel and cut into circles 1 cm thick. Cut the onions into rings. Peel the herring or anchovies, rinse and cut into pieces. Put mugs of potatoes in a salad bowl, then onion rings, pieces of fish on top. Mix olive oil with vinegar and mustard, pour over the salad and sprinkle with crushed parsley.