I found this recipe very intriguing. had never really thought of grilling grapes. The Greek recipe site I was looking through recommends using grapes to your preference: red with meat? white with fish? There's no right or wrong with this quick and easy decorative (and delicious) touch to other grilled foods. Personally I think the red grapes would taste better but use whichever you'd like. This recipe is based PER PERSON so adjust according to the number of servings you need to make.