Begin by warming 1 cup of heavy whipping cream in a medium saucepan over low heat until it's steaming but not boiling. Once warmed, steep 3 Earl Grey tea bags in the cream for 30 minutes, allowing the flavors to meld beautifully. After steeping, strain the cream to remove the tea bags, ensuring a smooth mixture for your London Fog Basque Cheesecake.

In a large mixing bowl, beat together 16 ounces of softened cream cheese and 3/4 cup of sugar using an electric mixer until creamy and well combined. Add 3 large eggs one at a time, mixing thoroughly after each addition. Next, gradually pour in the infused Earl Grey cream and 1 tablespoon of vanilla bean paste, blending until smooth. Finally, sift in 1/4 cup of flour and mix just until incorporated, creating a luscious batter.

Line a 9-inch springform pan with parchment paper, ensuring the paper comes up about 2 inches over the edges to contain the cheesecake batter. Lightly spray the inside of the pan with non-stick spray to prevent sticking.

Pour the creamy cheesecake batter into the prepared springform pan, smoothing the top with a spatula. Place the pan in a preheated oven at 425°F (220°C) and bake for 50-60 minutes. Keep an eye out for a deep golden-brown crust forming on the top, while the center remains slightly jiggly.

After baking, remove the cheesecake from the oven and let it cool in the pan for at least 4 hours, or overnight for best results. Once cooled, gently remove the cheesecake from the springform pan, preparing it for the glorious blackberry sauce to come.

To prepare the tangy blackberry sauce, blend 2 cups of fresh blackberries in a blender until smooth. Strain the mixture through a sieve to remove the seeds, collecting the puree in a saucepan. Add 1/2 cup of sugar, 1 tablespoon of cornstarch, and 1 tablespoon of lemon juice to the saucepan, and bring to a boil over medium heat, stirring constantly until the sauce thickens and becomes bubbly.

Allow the blackberry sauce to cool slightly before drizzling it generously over slices of your London Fog Basque Cheesecake. For an appealing presentation, garnish each slice with a few fresh blackberries.