How do you cook up a cloning potion?

To brew a cloning potion:

1. Press Boil, without any candies or lollipops in the cauldron.
2. Wait until the following message appears: Boiling... the water is burnt ! How is that even possible ?
3. Place some candies into the cauldron.
4. Press Stop and put everything into bottles.

Candies will become cloning potions at a ratio of 1337 candies per cloning potion. (That is, using 1336 candies will get you nothing, and using 2000 will still make only one cloning potion, wasting 663 candies.)