Scrub the potatoes if they need it, and cook in a pan of boiling, salted water for around 10-15 minutes, depending on size, until a knife slides easily through. Rinse underneath a cold tap and drain well. If the potatoes are large, cut into bite sized pieces and place in a bowl.
Add the sugar snap peas, spring onions and rocket into the bowl with the new potatoes. Break the salmon fillet up into large flakes and add to the bowl.
Mix the dressing ingredients together in a small bowl, and drizzle over the potato and salmon salad.
Toss together, divide between 2 plates and serve!