Creating Neapolitan Cake is a straightforward process if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour three 8-inch round cake pans.

2. Make Chocolate Layer:
– In a bowl, combine flour, sugar, cocoa powder, baking powder, baking soda, and salt.
– Add buttermilk, vegetable oil, egg, and vanilla extract. Mix until smooth.
– Stir in boiling water until well combined.
– Pour into one prepared cake pan.

3. Make Vanilla Layer:
– In another bowl, combine flour, sugar, baking powder, baking soda, and salt.
– Add buttermilk, vegetable oil, egg, and vanilla extract. Mix until smooth.
– Pour into the second prepared cake pan.

4. Make Strawberry Layer:
– In a separate bowl, combine flour, sugar, baking powder, baking soda, and salt.
– Add strawberry puree, vegetable oil, egg, and vanilla extract. Mix until smooth.
– Pour into the third prepared cake pan.

5. Bake Layers:
– Bake all three layers in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
– Allow to cool in the pans for 10 minutes before transferring to wire racks to cool completely.

6. Prepare Frosting:
– In a large bowl, beat the softened butter until creamy.
– Gradually add powdered sugar, alternating with heavy cream, and beat until fluffy.
– Mix in vanilla extract. If desired, divide the frosting into three bowls and tint one pink and one brown.

7. Assemble the Cake:
– Place the chocolate layer on a serving plate. Spread a layer of frosting on top.
– Add the vanilla layer and repeat the frosting process.
– Top with the strawberry layer. Frost the top and sides of the entire cake with the remaining frosting.

8. Decorate:
– Use the tinted frosting to create decorative patterns or swirls on the cake, if desired.