Combine the cookie crumbs, sugar, and butter until thoroughly combined. Press into the bottom and partially up the sides of a 9-inch round springform pan.
Bake 15 minutes. Set aside to cool.
To make the filling:
Using an electric mixer on medium speed, beat the cream cheese, sugar, and cornstarch until thoroughly combined and smooth. Add the eggs, one at a time, mixing well after each addition. Mix in the sour cream, lemon juice, vanilla extract, lemon extract, and lemon zest.
Pour into the pan, and smooth the top.
Bake 15 minutes.
Reduce the oven temperature to 200°F (95°C). Bake for 2 hours to 2 hours 10 minutes, or until the center is set and no longer looks wet.
Remove the cheesecake from the oven, and run a thin knife around the edges. Return it to the oven, turn off the oven, and leave for 2 hours.
Refrigerate overnight.
Garnish as desired before serving.
Notes
*Use either homemade lemon curd or store-bought to create a thin layer on top of the cheesecake or to dollop on top of individual servings.
Store in an airtight container in the refrigerator up to 5 days.