Place the lemon and lime juices, sugar and lime slices in a non-reactive saucepan over medium heat and simmer for 1–2 minutes or until the sugar has dissolved. Remove from the heat and leave to cool for 5 minutes.
Add the tonic and gin to the lemon syrup and stir to combine. Pour into 10 x 60 ml (2 fl oz/¼ cup) popsicle moulds and add a lime slice to each. Cover with plastic wrap and insert a stick through the plastic into each pop. Freeze for 8–10 hours or until completely frozen.
MAKES 10
85 ml (2¾ fl oz) lemon juice
60 ml (2 fl oz/¼ cup) lime juice
165 g (5¾ oz/¾ cup) caster (superfine) sugar
10 small lime or lemon slices
300 ml (10½ fl oz) tonic water
65 ml (2¼ fl oz) gin
10 popsicle sticks