Thoroughly wash and clean half of grapes and then sprinkle icing sugar on them. Leave them for as it is for some time.
Take a blender and add remaining half of grapes in it along with, ice cream soda and sugar syrup.
Add some grinded ice in it as required and further blend it well.
Take serving glasses, pour the cocktail in them and then garnish it by making use of grapes that were sugar coated.
Your juicy and delicious grapes cocktail is ready to cherish your guests. Serve chilled.