For the chocolate cake:
Melt the pastry chocolate.
Mix the flour, sugar, yeast and yogurt in a bowl. Once melted add a dash of soy milk, pastry chocolate, then add to the mixture.
For the vanilla cake:
In a bowl, mix the the flour, sugar, yeast, vanilla sugar, a few drops of vanilla aroma and yogurts.
Form the baking paper in your dishes and add mixture. Bake by monitoring regularly (to find out if it's cooked, plant the tip of a knife in the center, if there is any dough on it, It is not ready).
For the frosting:
Mix the icing sugar, water and dye. Once the cakes are baked and cooled you can spread the icing on top.
Prune the chocolate squares by giving them a shark fin shape and plant them in your cakes.

For the chocolate cake:
100 gram flour
125 gram sugar
1 packet dry yeast
75 gram pastry chocolate
2 plain yogurts
Dash of soy milk

For the vanilla cake:
100 gram flour
125 gram sugar
1 packet dry yeast
1 sachet vanilla sugar
Some flavors of vanilla aroma
2 plain yogurts
Dash of soy milk

For the icing:
150 gram icing sugar
25 gram water
A few drops of blue food coloring

For the 'fins':
10 squares dark chocolate or mint