Combine raspberry puree and sugar together in a large bowl, set aside.
In a small bowl, sprinkle gelatin over water and allow to soak for 5 minutes. Transfer bowl to microwave, heat in 10 second increments until gelatin dissolves into the liqueur.
Pour gelatin into fruit puree mixture, stir until well incorporated, then set aside while preparing the rest of the ingredients.
In a separate bowl (stand mixer, ideally!), whip egg whites until stiff peaks form. Carefully fold into chilled fruit mixture, stirring until combined.
Whip cream until stiff peaks form, then carefully fold in to the fruit mixture, stirring until combined.
Pour into 6 serving glasses, chill until set, about 2 hours.