I have a better idea:
Premake your drinking chocolate base using a scaled up recipe of 1 part liquor, 2 parts granulated sugar, and one part powdered sugar. We make 16 litres at a time, heat it to 165 degrees F and put it in a fridge to cool. It's important to NOT bring it to a boil, but heat it high enough to kill pathogens.
Then when a customer orders, we portion out 200ml and use a cappuccino steamer to heat it. It only takes a few seconds, and at that time the cornstarch in the powdered sugar thickens the drink, making it very rich and creamy.
We also have one of the drink dispensers, but there are challenges with it:
1. You have to throw out what you don't use at the end of the day (waste).
2. For higher volumes, 5 litres doesn't take you very far, so you have to keep refilling it.
3. It limits the types of drinking chocolates you can offer (one per machine)
4. If you use a true cocoa liquor and nobody buys a drinking chocolate for a while, you end up with a skim of very unattractive oil (cocoa butter) on top of the drink in the machine.
5.Multiple machines take upspace
6. Most dispenser binsare made of plastic, not glass. The plastic begins to look ratty after a being cleaned out a number of times.
By premaking a base, and using a steamer to heat individual portions, you can offer a multitude of drinking chocolates with different infused spices, because you add the spices to the drink just before you steam it in the cup. This steeps it just as if it were a tea.
Try this recipe:
1 oz good cocoa liquor
1 oz powdered sugar
2 oz granulated sugar
1/2 tsp Indonesian Cinnamon
1/8 tsp ground Cloves
Sweetened whip cream with a touch of vanillaon top with a sprinkle of fresh ground nutmeg.
My two bits for what it's worth.
Brad