Good-old Potato Salad

I tend to forget this simple yet good recipe exists. A perfect summer lunch, especially in Kyoto's daily 30+°C.

This one is with red onions, chive, red tōgarash (japanese long green peppers turned red) and green beans.

Update

How could I forget how well pickles match potatoes..?!
Another variation: red peppers, pickles, chive, red onions, black olives, olive oil.