Separate the eggs- egg whites and yolks- in two large bowls.
In the bowl with egg yolks - Add the butter, flour, lemon juice, vanilla extract, cream cheese and fresh cream. Add ¾ cup of the sugar and set the rest aside.
Using the hand mixer, mix it up. Make sure to scrape the sides.
Start whipping the egg whites with a hand mixer.Once they are foamy, add the left over ¼ cup sugar little at a time.
Once the eggs are forming soft peaks add the cream of tarter.Keep whipping till you get hard shiny peaks.
Now take the bowl with the rest of the ingredients.
Gently add in ⅓ the egg whites- Using the Cut & Fold method start incorporating the egg whites-Be sure not to mix or whip-the egg whites will deflate.
Repeat the step 2 more times till the egg whites are fully incorporated.(See Notes)
Pour the batter into the prepared pan.
Bake it in the oven at 300 F (150 degrees C) for 50- 60 minutes till the sides leave the cake pan and the middle is almost set. Depending on your oven, it will take 50 minutes to an hour.
Switch off the oven without removing the cheesecake from it.Let it cool gently inside the oven so that it doesn't crack.