Preheat the oven to 350°F (175°C). Grease and flour three 6-inch round cake pans.

In a mixing bowl, cream together the butter and sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition.

Gradually add the flour, cocoa powder, baking powder, and milk, mixing until combined.

Divide the batter into three bowls: leave one plain, mix one with strawberry puree, and the last with vanilla extract.

Pour each batter into the prepared pans and bake for 25-30 minutes or until a toothpick comes out clean.

Let the cakes cool completely.

To assemble, layer the vanilla, strawberry, and chocolate cakes with whipped heavy cream in between layers if desired.

Frost with additional whipped cream and decorate as desired.