Cut up potatoes into roughly 2cm x 2cm chunks. Place them into a large pot with enough cold water to cover. Bring the potatoes to a boil and then lower the heat to medium, letting them cook for about 12 minutes.

Meanwhile, mix all the ingredients for the dressing in a jug or mixing bowl.

Once the potatoes have boiled, drain all the water and leave them to steam dry in the pot for a couple of minutes.

Transfer potatoes to a salad bowl and leave to cool. Once cooled, pour over the dressing and mix well.

Sprinkle with chopped spring onion and serve.