Step 1

Combine sugar, 2 cups warm water and lemon rind in a saucepan over medium heat. Cook, stirring, for 5 minutes or until sugar is dissolved. Simmer, without stirring, for 10 minutes or until mixture thickens slightly. Remove from heat. Cool completely.

Step 2

Strain sugar mixture over a bowl. Stir in lemon juice. Pour into a 3cm-deep, 20cm x 30cm (base) lamington pan. Cover and freeze for 1 to 2 hours or until almost firm.

Step 3

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. Cover and freeze for 3 hours or until firm. Serve scoops of sorbet in waffle cones.