Scrub and rinse the potatoes , then put them in a pan of lightly salted cold water. Bring to the boil then simmer for 10-15 minutes until tender. Drain and transfer them into a large bowl, then cut them into bite-size chunks. Add the lemon juice and drizzle a little extra virgin olive oil over them, and toss well.
Heat the olive oil in a frying pan over a medium heat. Add the olives and the capers and fry for 2 to 3 minutes until crisp.
Meanwhile, finely slice the spring onions. Add these to the salad together with the olives&capers. Scatter over the coriander and toss.
Taste, season with salt &pepper if needed (be careful with the salt, the capers are very salty)!