lightly grease a loose-leaf cake tin (20cm diameter) and line it with parchment paper (bottom and sides).
mix crust ingredients, add melted butter and combine.
pour the mix into the cake tin and press it to the bottom evenly, then put it in the fridge while you prepare the filling
pre-heat oven to 160°C static.
Prepare the filling:
in a large mixing bowl, combine cream cheese and sour cream, add grated lemon zest, stevia, erythritol and vanilla extract, then use an electric whisk to amalgamate well.
add whole eggs and continue to whisk for a couple of minutes until light and frothy.
pour filling over the crust and bake for 1 hour and 15 minutes, then raise the temperature to 220°C and continue to bake for another 15 minutes or until golden brown.
let the cheesecake cool, then refrigerate it for at least a few hours until set (overnight is best).
Make the frosting:
stir all ingredients and place in a piping bag.
Finish:
remove cheesecake from the tin and peel off parchment paper.
pipe frosting all over and serve.
Notes
The only way to ensure accurate measurement of ingredients is with Metric Kitchen Scales.