I'll melt down some Callebaut (double boiler) and add cream (about 1:1). Then just add to hot milk and stir with a whisk until it's smooth and frothy. For extra fun a pinch of nearly ANY spice (my 2 favs are cayenne pepper or garam masala). So yummy on a cold winter's day. If one wants to get really fancy one can use a molinillo, but really, any kind of whisk works.
Cocoa powder, btw, is just ground up chocolate & powdered milk. When companies use low quality chocolate they add sugar. (High quality chocolate doesn't need extra sugar). The water part is to make the milk liquidy. It's also why cocoa powder doesn't stir into milk very well. In order to actually be considered "chocolate" chocolate products have to be at least 11% cacao. (Hershey's is at guess where?). If below 11% it has to be categorized as candy or "chocolaty" or cocoa. Cacao is quite expensive, so companies use fairly bland fillers like oils. Hence the need for extra sugar. (one also finds fillers in high quality chocolates, it's the only way to turn them into "bars", otherwise all chocolate is in nib, powder, or liquid form... and it tastes ghastly. There's already quite a bit of sugar and flavorings added to even the best chocolates. But the best chocolates are almost never lower than 60% chocolate. The "ideal" range for bar chocolate is 60-85%, excluding milk chocolate). But a medium quality chocolate (like ghiradelii) or high quality (like callebaut or valhrona) doesn't need the extra sugar when making ganache or syrup... because the chocolate is already quite sweet, and because of the high cacao content, very flavorful.
Mmmmmm.... chocolate!!!