For the base, put the biscuits in a plastic bag and bash to a crumb with a rolling pin. Melt the butter in a small saucepan, add the biscuit crumb and sugar and mix thoroughly. Press into the base of a loose-bottomed 20cm cake tin and set aside in the fridge to set.
For the filling, preheat the oven to 170C/Gas 3. In a large mixing bowl, combine the cheeses, sugar, eggs, vanilla, lemon zest and juice. Spoon into the base and smooth with a palate knife. Bake for 1 hour, then switch the oven off (without opening the door), leaving the cheesecake inside for a further 2 hours. Remove and allow to cool completely before removing from the tin.
For the sauce, place the ingredients in a food processor and whiz until smooth.
To serve, pour over the sauce, top with mixed berries, sieve over icing sugar, slice and serve.
Recipe by appetite magazine at https://www.appetitemag.co.uk/lemon-berry-cheesecake/