Directions
Boil potatoes in salted water until fork tender.
Drain and set aside.
Make a dressing for the potatoes by placing mustard, garlic, rosemary and vinegar in a bowl.
Whisk in olive oil until the dressing emulsifies.
In a separate bowl, place reserved potatoes, olives and red onion.
Add vinaigrette and toss.
Refrigerate for 2 to 3 hours to let flavours combine.
Serve at room temperature.