Chop cauliflower and broccoli. Thaw ... mix together. Mix sour cream, Hellmann's mayonnaise and dry original Ranch. Pour over cauliflower, broccoli, ... and peas; mix well.
Mix broccoli, cauliflower, carrots and onion in bowl. Mix together sour cream, dip mix and enough buttermilk to thin sour cream mixture. Pour over vegetables. Chill.