Pour hot liquid slowly to the cocoa powder into a bowl and whisk vigorously until there’s no more lumps.
Melt the chocolate in a bowl.
Pour 1/3 of the liquid onto the melted chocolate. Mix so as to obtain a smooth, elastic and shiny texture then pour the rest of the liquid while making sure to preserve this texture, and strain into a pan.
Heat the chocolate mixture just to a boil, whipping vigorously to obtain a light and creamy forth.