- In a small bowl take 1 tbsp instant coffee powder and 1 tbsp cocoa powder. dissolve in 2 tbsp warm water. take the choco-coffee decoction into the blender. and add 1 cup milk, 1 scoop vanilla ice cream and 2 tbsp chocolate sauce. also, add 1 tbsp sugar and cubes ice.blend well until the milkshake turns frothy. pour the chocolate cold coffee into a glass.