Combine sugar and 1 cup water in a saucepan over medium heat, stirring, for 5 minutes or until sugar is dissolved. Simmer without stirring for 10 minutes or until the mixture thickened slightly.
Remove from heat. Cool completely.
Place Creative Gourmet Frozen Watermelon Chunks in a food processor or blender.
Process until smooth. Using a fine sieve, strain watermelon into a large bowl. Discard pulp.
Add sugar mixture, lime rind, rose water and lime juice. Stir to combine.
Pour into a 3cm-deep, 20cm x 30cm (base) lamington pan. Cover and freeze for 1 to 2 hours or until almost firm.
Transfer fruit mixture to a food processor. Add eggwhites. Process until smooth but not melted. Pour mixture into a 6cm-deep, 11.5cm x 21.5cm (base) loaf pan that has been lined with cling wrap.Cover and freeze for 3 hours or until firm.