Place potatoes in a large
saucepan, add water to cover. Bring to a boil. Reduce heat, cook, uncovered,
until tender, 8-10 minutes.
Meanwhile, chop green onions,
reserving white portions for salad. Add green portions to a blender. Add
avocados, parsley, mayonnaise, tarragon, capers, HOT SAUCE and seasoned salt.
Cover and process until blended, scraping down sides as needed.
Drain potatoes, transfer to a
large bowl. Add celery, white portions of green onions, and dressing; toss to
coat. Refrigerate, covered, at least 1 hour. Top with radishes and additional
parsley.