Start by covering a baking form with removable edges with baking paper.
With an hand blender crumble the cookies.
Melt the butter and mix with the cookie crumbles.
Pour it in the baking form and press it evenly so it covers the bottom. Place in the fridge while continuing with the filling.
In a bowl mix the whip cream and cream cheese until creamy, might take a few minutes.
Add the icing sugar and vanilla sugar.
Grate the zest from 1 lemon and mix with the filling.
Spread evenly on the cake bottom.
Place in the fridge while making the lemon curd.
Grate the zest of 2 lemons, put in a casserole. Squeeze out the juice of the lemons in the casserole.
Start the heat and let it boil for 1 minute.
Pour away the zest in a sip. Pour back the juice in the casserole.
Add the eggs, sugar and corn starch. Let it simmer on low heat for 2 minutes while stirring.
Take away from the heat and add the butter, continue stirring until it becomes thicker.
Let it cool down in temperature.
Take out the cake and spread the lemon curd every on it. Place in the fridge for minimum 2 hours before serving it.