-
Combine the cream cheese and sugar in a large mixing bowl and beat on medium with an electric mixer until smooth.
-
Beat in the sour cream, vanilla, lemon zest, and salt to combine.
-
Beat in the eggs 1 at a time, mixing on low speed until just combined. Scrape down the sides and bottom of the bowl, then beat about 1 minute more to ensure everything is mixed together well.
-
Pour half of the filling into the crust. Dollop half of the blackberry puree over that and use a butter knife to swirl the two together a bit. TAKE CARE NOT TO DISTURB THE GRAHAM CRACKER CRUST while you’re swirling!
-
Repeat this process with the remaining filling and the remaining puree. Set the cheesecake on a rimmed baking sheet to catch any butter that might leak out and make a mess in the oven.
-
Bake for 55 to 65 minutes, until the center barely jiggles when you tap the side of the pan.
-
Cool your cheesecake to room temperature, then cover loosely with plastic wrap and refrigerate overnight.