Preheat oven to 350°F (180°C). Line three cake pans with parchment paper or grease and flour them.
In a large bowl, whisk together the flour and baking powder.
In a separate 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 dry ingredients to the wet ingredients, alternating with the milk and vanilla extract. Mix until just combined.
Divide the batter into three equal portions. Leave one portion plain. To the remaining two, add different amounts of raspberry puree and food coloring (if using) to create an ombre effect.
Pour the different colored batters into the prepared cake pans and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean. Let cool completely in the pans.
Whip the heavy cream and powdered sugar until stiff peaks form. Gently fold in some raspberry puree to tint the whipped cream to match the cake layers.
Assemble the cake layers, starting with the darkest shade at the bottom. Frost each layer with the raspberry whipped cream. Smooth the frosting with a spatula.
Garnish the top of the cake with fresh raspberries and refrigerate for at least 2 hours to allow the frosting to set.
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