Step 1: Make the Red Velvet Cake

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.
2. Mix Dry Ingredients: In a bowl, whisk together flour, sugar, baking soda, cocoa powder, and salt.
3. Combine Wet Ingredients: In another bowl, mix oil, buttermilk, eggs, food coloring, vanilla, and vinegar until smooth.
4. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined.
5. Bake: Pour the batter into the prepared pan and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean. Let cool completely.

Step 2: Prepare the Cheesecake Filling

1. Beat Cream Cheese: In a mixing bowl, beat the softened cream cheese until smooth.
2. Add Sugar and Vanilla: Gradually add powdered sugar and vanilla, mixing until well combined.
3. Whip Cream: In a separate bowl, whip the heavy cream until stiff peaks form.
4. Combine: Gently fold the whipped cream into the cream cheese mixture until fully combined.

Step 3: Make the Strawberry Sauce

1. Combine Ingredients: In a saucepan, combine sliced strawberries, sugar, and lemon juice.
2. Cook: Cook over medium heat until the strawberries release their juices and the mixture thickens slightly, about 5-7 minutes.
3. Let Cool: Remove from heat and allow the sauce to cool before using.

Step 4: Assemble the Cake

1. Layer the Cake: Once the red velvet cake is completely cool, slice it in half horizontally. Place one layer on a serving plate.
2. Add Cheesecake Filling: Spread half of the cheesecake filling over the first layer of cake.
3. Add the Second Layer: Place the second layer on top and spread the remaining cheesecake filling over it.
4. Drizzle with Sauce: Pour the strawberry sauce over the cheesecake.
5. Garnish: Decorate with fresh strawberries and whipped cream.