If you show the voucher when you order the CM's are more than happy to help you. At RFC our server understood exactly how to do it and suggested ways to get more of what we liked for our voucher.
We used 1 VKL for 2 adults and had a chocolate smoothie, and huge crab dip appetizer, the 14 oz steak and lobster stuffed with crab meal with Napa Vegetables(YUM!) and rice, and a giant apple cobbler with lots of ice cream for dessert. We were so stuffed we could not finish the dessert!
We ran into the same kind of deals with the Q & C voucher at Pepper Market. We split the prime rib dinner and it included vegetables and a side dish. We had a giant stuffed baked potato and a dessert and they were a meal in themselves! We also had a beverage, orange juice I think. The server will bring you a second plate and silverware.
We took our dessert back to the resort in a carry out and had it with coffee for breakfast the next day!