In a mixing bowl, combine sugar and lemon zest. Gently rub the zest into the sugar using your fingertips to release its natural oils, which enhances the lemon flavor.
Add the cream cheese and beat with an electric mixer or hand whisk until smooth and lump-free.
Pour in the Rooh Afza and lemon juice, then whisk until fully incorporated.
Separately, whip the liquid whipping cream until it reaches medium-stiff peaks. Be careful not to over-whip, as it could lead to splitting when combined.
Gently fold the whipped cream into the cream cheese mixture in two parts, using a silicone spatula and slow, careful motions to maintain its light texture. Continue folding until no streaks remain.
Spread this cheesecake mixture over the chilled biscuit base, smoothing the top with an offset spatula.
For an extra touch, you can add a few drops of Rooh Afza on top and swirl it lightly into the cheesecake.
Cover and refrigerate for at least 4-6 hours, or ideally overnight, to allow it to set completely.