Scrub potatoes; cook in large pot of boiling salted water until just tender, about 20 minutes. Drain potatoes; and while hot, cut unpeeled potatoes diagonally into 1/2-inch slices. Place in shallow glass dish.
Pour dressing over hot slices. Let stand for one hour, turning once. Remove potatoes from dressing and place on grill.
Grill potatoes until golden, turning occasionally for about 20 minutes. Season with salt and pepper after turning.
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