Prepare the Crust: Process the graham crackers in a food processor until fine. (You can do this in a plastic bag with a heavy wood spoon or rolling pin if you don't have a food processor.)
Mix the graham cracker crumbs with the melted butter, vanilla, ginger, salt and sugar until combined and crumbly. Press VERY FIRMLY into a parchment lined 9x9 inch pan. Freeze for about 15 minutes while making the cheesecake filling.
Prepare the Cheesecake Filling: In a medium bowl, use an electric mixer to beat the softened cream cheese and sugar until smooth and creamy. Add in sour cream, vanilla, lemon juice and zest, and powdered sugar. Beat until smooth.
In a separate bowl, add the very cold whipping cream and beat on high until stiff peaks begin to form. Gently fold the whipped cream into the lemon cream cheese mixture until fully combined.
Transfer the cheesecake mixture to chilled crust. Spread evenly until smooth. Chill for at least 8 hours to set—I let it set overnight for easiest slicing.
Serving: Before serving, you can make optional lemon whipped cream by beating the heavy cream in a small bowl, slowly adding in the powdered sugar, vanilla extract and lastly the lemon juice. This is a subtle lemon whipped cream flavor—for stronger flavor, fold in about 1 tsp very finely zested lemon zest (some people won’t want that texture.
Slice and pipe a bit of the whipped cream on each square and a small slice of lemon. Serve!