1 Mix together the butter and biscuit crumbs. Press the mixture firmly into the base of a 22-23 cm loose bottomed cake tin and chill whilst preparing the filling.
2 Beat together the Philadelphia, sugar until smooth. Add the eggs, one at a time, mixing on low speed after each addition until just blended.
3 Stir in the flour, soured cream and lemon zest and juice.
4 Bake at 170 °C, gas mark 3 for 1 hour or until firm. Turn off the heat and leave to cool in the oven for 1 hour. Chill completely before serving. If liked serve with seasonal berries.
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