German potato salad (no mayonnaise)

-500g small potatoes-1 cucumber-1 small onion
Dressing:-sunflower oil-lemon juice-salt, pepper
Cook the potatoes, let them cool.Slice cucumber very thin. Cut potatoes into bite size pieces. Chop onion really small.Make dressing and pour over salad.Let sit 1-24 hours (the longer the tastier) Serve with meatballs, sausage or steak