The batch and continuous processes can be compared to the production of the cocoa drink, known as “chocolate milk” and various other trade names, using two methods. When the drink is produced in “batch” form, measured amounts of cocoa, sugar and milk are added to the reactor. The materials are mixed and heated, and after a suitable delay, chocolate milk, whose color and taste are constant in accordance with the program, is obtained. Only after the conclusion of the process is the drink put into storage tanks and then the process can be restarted and a further batch of chocolate milk prepared. If no faults occur and the instructions are strictly observed, the second batch will be identical to the first.