Line a tray with baking parchment and place tart shells on top.
For the cheesecake mixture, squeeze the mozzarella well to remove any excess liquid, then add to a food processor and blend until creamy. Add 50gm of the icing sugar, along with the lemon juice and vanilla and mix to combine.
Remove the gelatin from the water and squeeze out any excess liquid. Warm it through with about 2 tablespoon of the cream, until the gelatin has melted into the cream, then combine with the mozzarella.
Whip the remaining cream to soft peaks, then mix gently into mozzarella with the remaining 50gm of icing sugar.
Spoon the cheesecake mixture into the tart shells and place in the fridge for at least 4 hours (or overnight) to set.
Place the extra 100gm of mozzarella in the freezer to chill and become firm.
Place fresh raspberry over the cheesecake tarts and dust icing sugar over.
Grate over a little of the frozen mozzarella onto each tart and serve.