Throw in the 2 cups of frozen grapes in a blender along with 1 ¼ cup of water and 2 tablespoons of honey.
Blend it all together for 1-2 minutes until all the grapes have broken up and the Grape Shake looks nice and smooth. If it looks too thick add a bit more water. The shake should have a slight drinkable slushy consistency.
To serve pour the Frozen Grape Shake into two glasses and drink right away.