Wash the potatoes well and if they are large, cut them into halves or quarters; try to keep your pieces about the same size so they cook at the same speed. Bring a pot of water to boil, add the potatoes, and cook until they are tender when pierced with a fork. The time will depend on the size of the potatoes (my large, cut in half potatoes took about 25 minutes).
Drain the water from the potatoes in a colander and rinse them with cold water to cool them down enough to handle. If you want, you can peel them (I didn’t). Chop them into bite-sized cubes and place in a large bowl.
Whisk together the remaining ingredients except the onions in a small bowl. Pour over the potatoes and mix well. Stir in the onions. Check flavor and add more vinegar, salt, pepper, or smoked salt to taste. Serve warm or at room temperature.
Each serving is 4 points on Weight Watchers Freestyle program.