Put the ice cream base in a 1-gallon container. Add the vanilla, lemon concentrate, and buttermilk and stir to combine. Freeze until the mixture forms a peak, about 10 minutes.
After freezing, fold in the cheesecake and graham cracker pieces. Then swirl in the blueberry sauce. Let harden thoroughly in the freezer before serving, approximately 12 hours in a home freezer.
You can swirl the 2 ice cream flavors together (Blueberry Buttermilk Cheesecake and Chocolate Cinnamon Caramel) if you keep 1 flavor semi-soft while the other is being prepared.
This recipe assumes you are using a pre-made ice cream base. You may use softened vanilla ice cream, but then omit the buttermilk, and fold all the remaining ingredients into the softened ice cream at once and then freeze until hardened.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.