01 - Preheat the oven to 325°F and line an 8-inch square baking pan with parchment paper, leaving an overhang on two sides.
02 - Mix graham cracker crumbs, sugar, melted butter, and salt in a bowl, then press firmly into the bottom of the prepared pan. Bake for 10 minutes and let cool slightly.
03 - Combine raspberries, sugar, and lemon juice in a saucepan over medium heat. Stir and mash for 3–5 minutes until thickened, then strain through a fine sieve to remove seeds. Set aside to cool.
04 - Beat cream cheese and sugar until smooth. Add eggs one at a time, mixing well after each. Incorporate vanilla, lemon zest, lemon juice, and sour cream until fully combined.
05 - Pour the cheesecake batter over the cooled crust and smooth the surface evenly.
06 - Spoon raspberry sauce over the batter and swirl gently with a toothpick or knife for a marbled effect.
07 - Bake for 30–35 minutes until edges are set and the center remains slightly wobbly.
08 - Allow to cool to room temperature, then refrigerate for at least 2 hours before slicing into 16 squares.