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Heat 1" salted water (1/2 teaspoon salt to 1 cup water) to boiling.
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Add unpared potatoes.
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Cover and heat to boiling; cook just until tender, about 30 minutes.(Do not overcook.).
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Cut hot unpared potatoes diagonally into 1/2" slices.
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Place in shallow glass dish; pour dressing on hot slices.
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Let stand 1 hour, turning slices once.
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Remove potato slices and place on grill 4" from hot coals.
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Cook 8-10 minutes. Turn; sprinkle salt and pepper on slices and cook until golden brown, about 8-10 minutes longer.