Combine the crushed ginger biscuits with the melted butter and press into a tin. Chill in the fridge while you make the topping.
Pour the double cream into a bowl, add the cream cheese, icing sugar and the zest of 2 lemons.
Now juice 3 lemons - you should have around 85ml of juice. If you have more than 85ml or 1/3 cup, discard the rest. Don't use more than 85ml or 1/3cup as it will be too runny. (You may want to zest the third lemon now as it is used to decorate the cheesecake - it is much easier to zest a whole lemon rather than one that has been juiced).
Whisk until it's very thick โ almost the consistency of ice cream. Use an electric whisk if you have one.
Remove the base from the fridge and add the cheesecake mixture, smoothing the top.
Pop into the fridge for at least 4 hours (or overnight/up to 24 hours if you don't need it until the next day).
Remove from the tin then sprinkle the edges with the remaining lemon zest before serving.
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