Step 1
Place the sugar and 1/3 cup (80ml) water in a small saucepan over medium-high heat. Cook, stirring, for 2 mins or until sugar dissolves. Bring to a simmer and cook for 5 mins. Set aside to cool completely.
Step 2
Place white peach, pineapple, 1/3 cup (80ml) prosecco or sparkling water, half the orange juice and half the sugar syrup in a blender. Blend until smooth. Strain through a fine sieve into a metal container. Cover with foil and place in the freezer for 6 hours or until firm.
Step 3
Place the yellow peach, 1/3 cup (80ml) prosecco or sparkling water, remaining orange juice and remaining sugar syrup in a clean blender. Blend until smooth. Strain through a fine sieve into a separate metal container. Cover with foil and place in the freezer for 6 hours or until firm.
Step 4
Stand white and yellow peach mixtures at room temperature for 5 mins to soften slightly. Break up peach mixtures. Place the yellow peach mixture in a food processor and process until smooth, then divide 4 scoops of the mixture among 4 chilled serving glasses.
Step 5
Repeat with the white peach mixture, placing 1 scoop into each glass over the yellow peach mixture. Pour over remaining prosecco or sparkling water and top with mint to serve.