Bring a large pot of salted water to a boil.
Add the potatoes and boil until just starting to get tender, about 20 minutes.
Drain and let cool.
Cut potatoes into 4ths.
Optional: Fire up a grill and place potatoes on the grill, turning, just long enough to get some grill marks. Remove and let cool.
Whisk remaining ingredients together. Add potatoes.
Cover and refrigerate for at least an hour before serving.