you need:
-red food coloring
-pink icing
-red chocolate or candy (I bought a bag in an american store)
-pink fondant
-I used a pan thats similar to this:

You just have to make a the cakes with a normal recipe for cakes but adding the color. Then melt the red chocolate until you can mold it. then make a form of a heart and put it on the top of the cake. Then make mini hearts with the pink fondant and put them over the cake. For finishing decorate your cake with the pink icing and enjoy it! :) I hope you like it and thanks for passing bye ^^