How to Make It
Place the raspberries and lime juice in a blender; process until smooth.
Combine water, sugar, and champagne in a medium saucepan; bring to a boil. Reduce heat; simmer 1 minute or until sugar melts. Remove from heat; stir in raspberry purée. Pour the mixture into a large, shallow baking dish. Cover and freeze 8 hours.
Remove dish from freezer, and let stand for 5 minutes. Scrape entire mixture with a fork until fluffy.