Sift cocoa powder and sugar together. Den combine till well incorporated. Den set oil on low heat,or melt butter for 5mins,den add 🍫 chocolate bar if you want, den add d combined cocoa powder and sugar into d oil and mix well on low heat fire for 2mins,den switch off fire quickly.combine well, den allow to cool. It might look so thick. You can reduce the 1cup oil if it too much to you.