Cut the potatoes into bite-sized pieces and put them in a pan of lightly salted water.
Bring to the boil, then gently simmer for 10-15 minutes until tender.
Meanwhile, chop the spring onions and thinly slice the tomatoes.
When the potatoes are done, drain and add them to a bowl. Add the spring onions, olives, oregano and sliced tomatoes. Add some of the oil from the jar of the sun-dried tomatoes and supplement it with more olive oil.
Add the vinegar, season with salt and pepper, then gently combine.
Add some chopped fresh herbs of your choice, toss and serve.