Chocolate pudding

-1 cup of milk (250 ml) -3 tablespoons of cocoa powder -3 tablespoons of sugar -3 tablespoons of flour -70-80 grams of butter I put a saucepan on the stove, pour in the milk, add sugar, flour, and cocoa. I turn on the stove and occasionally stir with a whisk, otherwise the flour starts to stick to the bottom. It boiled, steamed, I cooked it for about a minute and removed it from the heat. We'll let it cool for about 20 minutes. Now we add pieces of butter and mix well, the mass immediately became shiny. I grate 1/4 of a chocolate bar on top (not mentioned in the recipe) I transfer the mixture to a jar. The pieces of chocolate melted. Delicious. If you also add ground nuts, it will be super!