Step 1

Place the potatoes and carrots in a pot, add water and bring to the boil. Then simmer until tender (don't overcook them!). You can boil the eggs in the same pot and remove them after 6-8 minutes (or boil them separately). Drain and set aside to cool, then peel and chop the ingredients into small cubes and place in a large bowl. Finely chop the gherkins and add into the bowl.

Step 2

Peel and core the apples, cut into quarters and finely chop. Combine with the salad.

Step 3

Add the yogurt, mayonnaise, mustard and seasoning to the mixture and stir carefully but thoroughly. Refrigerate, covered, for up to 2 days. If possible chill for 1 hour before serving.