CHOP 7-8 medium potatoes into cubes; toss in a bit of oil and double-wrap in aluminum foil, folding to seal completely.

PLACE on a medium-hot grill. Turning occasionally, cook for 25-30 min. or until potatoes are tender when pierced.

TOSS potatoes in a large bowl with 3/4 cup each Miracle Whip Dressing, chopped green onion, celery, radishes and thawed, frozen peas. Serve right away or cover and refrigerate until ready to serve.