I am planning to startup a waffle store, for that I have bought a 750g jar of nutella. I also need to melt a chocolate bar. Now I am willing to make the nutella and chocolate bar less dense or liquify it to be able to pour it as a topping on waffle. The topping needs to stay liquid at room temperature.
I have watched a couple of videos where it is instructed to add a little bit of water,milk or vegetable oil. What would be the best option to get my desired consistency and most important the flavour need to be the same, and can be left at room temperature?