Sophie's favourite: pink salad

Pink (Beetroot) salad:

4 medium beetroots, boiled and diced
3 potatoes, boiled and diced

3 herrings/rolmops, diced

1 sweet apple, finely diced
10 cocktail onions, halved
7 gherkins, diced
3 tablespoons of greek yoghurt
1 tablespoon of mayonnaise