Whizz 400g cherries (reserve the rest) in a food processor with 2½ tbsp icing sugar, 1 tbsp lemon juice, 4 tbsp yogurt and 4 tbsp water until smooth. Spoon into one end of a 2ltr freezer-proof container to fill one-third of it. Level the top and sides, then freeze.
Wipe out the food processor bowl. Blitz the mango with the honey, 1 tbsp lemon juice, 3 tbsp yogurt and 4-5 tbsp water until smooth. Taste and add a bit more lemon or sugar if needed. Spoon into the container next to the cherry frozen yogurt and return to the freezer.
Wipe out the bowl again and blitz the blueberries with the remaining icing sugar, lemon juice, yogurt and 3 tbsp water until smooth. Spoon into the final third of the container and level the top. Serve immediately or, for a better scoop, freeze for 1 hr. Drag an ice cream scoop along all 3 frozen yogurts and drop into small sundae glasses. Top with mint leaves and the reserved defrosted cherries.
