This is the basic recipe but you can add your own tweaks e.g. use ginger nuts instead of digestives, substitute two tbsp of jam for the sugar and lemon, etc
Ingredients
500g full fat cream cheese (Ideally Quark but any cream cheese will do)
100g sugar
Zest and juice of 1 lemon (you can use any fruit)
3 eggs (separated)
6-8 digestive biscuits (crushed)
80g butter
Method
1) Grease a springform cake tin and line with baking paper
2) Place crumbs and butter in a pan and heat through until the melted butter has combined with the biscuit.
3) Using the back of a spoon, press the butter/biscuit mix evenly into the base of the cake tin.
4) In a bowl, place the cream cheese, egg yolks, lemon and sugar and mix together.
5) Beat the egg whites until they reach a soft peak consistency.
6) Fold egg whites into the rest of the mixture
7) Pour the mixture into the cake tin.
8) Bake at 120 C (fan oven) for about an hour (do not open the oven until then as it may sink)
9) Check the cake is cooked by inserting a skewer and see if it comes out clean
10) Raise the temperature to about 160 C and check after 10 mins to see if the top of the cake has browned. Repeat until the desired finish has been achieved
Remove from oven, allow to cool, then eat!