Princess Crown- use of items and cooking

Anyone able to tell me how to use the pan? I guess I need more than a basic food item.

What are so those bags for (look a bit like they contain money or something they cost 4g I think and are dropped by goblins for example). Or do they contain spice for cooking?

Same with plants that enemies drop sometimes (demons for example)- what are they good for?

There`s a great faq at gamefaqs, but this is not covered.