Strained, pureed red grapes are the base for this sweet and tangy grape cocktail. If you have very sweet grapes, you might not need the full amount of honey. Taste as you go. For a special treat, freeze extra whole grapes ahead of time and float them in the drink along with the ice cubes.
Source: http://www.delish.com/entertaining-ideas/parties/cocktail-parties/summer-cocktails