3 lemons, zest and juice (about 80ml/2戮fl oz)
75驳/2戮辞锄 lemon curd
140g/5oz icing sugar, sifted
275g/9戮oz gingernut biscuits
100驳/3陆辞锄 butter, melted, plus extra for greasing
625g/1lb 6oz full-fat cream cheese
150ml/5fl oz double cream