Mango and lime sorbet

Method

1. Gently heat the lime zest, juice and sugar in a heavy-based pan with 150g water until the sugar dissolves. Turn up the heat, bring to the boil and simmer for 3-4 minutes.
2. Whizz the mango in a blender until smooth. Add the sugar syrup and whizz until combined. Leave to cool, then pour into a sealable container and freeze until solid. Remove from the freezer, leave until soft enough to spoon into a food processor, then add the egg white and whizz until smooth. Return to the container and freeze until ready to use. Take out of the freezer 5 minutes before serving.