Place the potatoes in a pot of cold heavily salted water and bring to the boil over a high heat. Simmer gently for 15 minutes or until the potatoes are tender when pierced with a fork. Drain and allow to cool before slicing in half.
For the dressing, whisk all the ingredients in a small bowl and season to taste with salt and pepper.
Assemble the potatoes in serving dishes, topping with hot smoked salmon, spring onions, cucumber slices and dill fronds.
Spoon generous dollops of the dressing over each plate and serve.
Notes
Boil some potatoes, flake the hot smoked salmon and you have the building blocks for a filling meal. Capers, salad leaves, soft boiled eggs can all be added to make a quick dish.