Let's add starch, flour, cocoa, sugar and milk to a suitable pot and mix. Let it boil over medium heat, stirring constantly, and cook until it thickens.

After it boils, add butter and chocolate and mix.

Let's fill the dessert evenly into the bowls we have soaked with water. Let's keep it in the refrigerator for 2-3 hours.

Let's take our dessert out of the fridge, turn it upside down and put it on a serving plate.

Let's sprinkle cocoa on it and serve.