For Salad: Place potatoes in saucepan. Cover with water; add salt and bring to boil. Boil, partially covered, 15-20 minutes until potatoes are just fork tender. Drain and cool potatoes just until warm enough to handle. Cut potatoes horizontally into 1/2-inch rounds. Salt. Add green onion slices to warm potatoes, toss lightly and let sit 15 minutes or until potatoes are totally cooled. Add celery and red peppers. Salt and pepper salad. Stir, being careful not to break up potatoes. Add 1 cup
Quark dressing and mix. Add additional dressing, if desired. Refrigerate until serving time and set out 20-30 minutes before serving