Bring a large saucepan of water to the boil and add your potatoes.
Boil your potatoes for around 15 minutes.
Do a taste test and if your potatoes are al dente, remove them from the heat, drain and leave to cool.
Your potatoes will continue to cook as they cool so don't leave them boiling until they are soft otherwise, they will break up later.
Once cooled, add your potatoes to a large serving bowl and add the onion, peppers & parsley and carefully mix everything together.
Now sprinkle the chilli flakes and sumac into your potato salad.
Squeeze the lemon juice all over the salad and drizzle the oil.
Mix again and serve as part of your meze table or as an accompaniment to meat and fish.