Separate the red and green grapes into tiny clusters of 5 to 10 grapes each. In a small bowl, slightly beat the egg white with a fork to break it up well. Place the sugar on a piece of wax paper or in a small bowl. Dip each grape cluster into the egg white, coating it thoroughly. Then dip it into the sugar, also making sure to coat it well. Place on a wire rack and allow to dry. Serve the same day.
