Boil potatoes until they are cooked through. Be careful not to overcook them and they begin to crumble.

Remove cooked potatoes from water and place in a bowl with ice. Place in fridge and allow potatoes to cool.

Once potatoes are cool, remove from fridge and slice them into bite size pieces. Place potatoes into a large mixing bowl.

Add pesto, onions, Parmesan, and pepper to potatoes. Stir gently till all potatoes are coated and pesto evenly mixed.

Serve, or place covered in fridge till you are ready to eat.