Lightly grease a baking sheet. In a 1 quart glass measure, combine walnut halves, sugar, and water. Cook in microwave oven on high setting for 8 to 8 1/2 minutes, or until sugar has caramelized. Stir several times during cooking.
Pour out onto prepared baking sheet, and separate into pieces.
Let cool completely. store in an airtight container.
