Raspberry Sorbet

Combine water and sugar in a medium saucepan and bring to a boil, stirring to dissolve the sugar. Boil for 2 minutes, then remove from the heat. Stir in the lemon juice and crème de cassis. Transfer to a medium bowl and let cool completely. Puree the raspberries in a food processor, then strain through a fine-meshed sieve into the bowl containing the sugar syrup. Chill until cold, then process in an ice cream maker according to the manufacturer's directions. (Alternatively, freeze the mixture in a shallow metal cake pan or ice cube tray until almost solid. Break into chunks and process in a food processor.) Transfer the sorbet into a freezer container and freeze at least 1 hour.