01 - Preheat the oven to 350°F. Grease and line a 9-inch springform pan with parchment paper.
02 - In a large bowl, whisk together all-purpose flour, granulated sugar, cocoa powder, baking soda, and salt. In a separate bowl, combine buttermilk, vegetable oil, egg, vanilla extract, white vinegar, and red food coloring until fully blended.
03 - Gradually mix the wet ingredients into the dry ingredients until batter is smooth. Pour into the prepared springform pan and bake for 20 to 22 minutes, or until a toothpick inserted in the center emerges clean.
04 - Remove the cake from the oven and allow it to cool completely in the pan while preparing the cheesecake filling.
05 - Reduce oven temperature to 325°F. Using an electric mixer, beat the softened cream cheese and granulated sugar until smooth. Add eggs one at a time, beating after each addition. Stir in the vanilla extract and sour cream until well combined.
06 - Pour the cream cheese mixture over the cooled red velvet cake base and spread evenly. Place a pan of hot water on the lower rack of the oven to create steam. Bake for 45 to 50 minutes, until edges are set but center remains slightly jiggly.
07 - Turn off the oven and let cheesecake rest inside with door slightly ajar for 1 hour. Remove, then refrigerate for at least 4 hours or overnight to fully set the layers.
08 - In a small saucepan over low heat, stir strawberry jam or preserves together with lemon juice until smooth and pourable. Allow glaze to cool slightly.
09 - Arrange sliced fresh strawberries on top of the chilled cheesecake, then drizzle with strawberry glaze for a glossy finish. Slice and serve cold.