Peel and cut the potatoes into bite-sized pieces. Soak them in water and drain. Slice the onion thinly, sprinkle with salt, let sit for 10 minutes, then rinse and drain.

Place the potatoes in a microwave-safe container, cover loosely with plastic wrap, and microwave at 600W for about 5 minutes until soft. Mash the potatoes.

Once the potatoes have cooled slightly, add the onion and mix. Then add the seasoning ingredients (mayonnaise, vinegar, curry powder, salt, and pepper) and combine well.