Bring 6 cups water and 2 teaspoons salt to a boil. Add potatoes and cook for 15 minutes, until just tender when a fork pushes through. Drain and rinse with very cold water, to stop the cooking. Pat dry if needed, and set in a bowl with red onion and parsley.
In a blender or mini food processor add garlic, vinegar, mustard, thyme, Sunshine Dust, salt, pepper. Pulse a few times to get things mixed. Then slowly stream in olive oil, through hole on top, and blend on high for 20 seconds.
Stop, stir, and blend again for 20-40 seconds, until completely smooth and it comes together.
Stir sauce into bowl with potatoes, and garnish with extra parsley, salt, and pepper.