Preparation:
1. Combine first 3 ingredients, cover and chill 30 minutes.
2. Place watermelon mixture in container of an electric blender or food processor. Top with cover, and process until smooth, set aside.
3. Sprinkle gelatin over water in a small sauxepan, let stand 1 minute. Cook over medium heat, stirring until gelatine dissolves, remove from heat.
4. Combine watermelon mixture, gelatin and milk. Pour into freezer container of a 5-quart hand-turned or electric freezer.
5. Freeze mixture according to ther freezer manufactuer's instruction or until fir | 