The Foundation (The Crust)
Prep: Preheat your oven to 175°C (350°F). Line the bottom of a 9-inch springform pan with parchment paper and grease the sides lightly.
In a medium bowl, stir together the graham cracker crumbs, sugar, cinnamon, and melted butter until it resembles wet sand.
Press the mixture firmly into the bottom of the pan and about half an inch up the sides. Use the bottom of a flat measuring cup to ensure it is packed tightly.
Bake for 8 minutes. Remove and let it cool completely. This step is vital to prevent a soggy crust.
The Artisan Strawberry Reduction
Blend the fresh strawberries until completely smooth.
Transfer the puree to a small saucepan over medium heat. Stir in the sugar, cornstarch, and lemon juice.
Simmer for about 5–8 minutes until the mixture thickens and coats the back of a spoon.
Pass the hot mixture through a fine-mesh sieve to remove all seeds. This creates the "glass-like" finish necessary for competition. Set aside to cool.
The Velvet Filling
In a large bowl, beat the room-temperature cream cheese and sugar on medium speed until completely smooth and aerated (about 3 minutes).
Add the sour cream, vanilla, and salt. Mix until combined.
Gently fold the melted (but not hot) white chocolate into the batter. This is a professional technique that prevents the chocolate from seizing.
Add the eggs one at a time, mixing on the lowest speed just until the yellow disappears. Do not overmix, as air bubbles cause cracking.
The Marbling & The Water Bath
Pour the white batter over the cooled crust. Drop small, teaspoon-sized dollops of the strawberry reduction over the top.
Use a toothpick or skewer to swirl the strawberry dots. For a Valentine's theme, pull the toothpick through the centre of a dot to create a heart shape.
Wrap the outside of the springform pan in three layers of heavy-duty aluminium foil. Place it in a large roasting pan and pour 1 inch of boiling water into the roasting pan.
The Controlled Bake & Chill
Bake at 160°C (325°F) for 70 minutes.
The edges should be set, but the centre 2 inches should still "jiggle" like gelatin.
Turn off the oven and crack the door slightly. Leave the cake inside for 60 minutes. This prevents the surface from sinking.
Remove from the water bath, take off the foil, and refrigerate for at least 7 hours (preferably overnight) before releasing the springform ring.