In Italy (but not only) there are many brands of pasta. Imagine if I had a special ingredient in mind that would make the above achievable.
How can the company know the promises are realistic? What happens if the idea fails for any reason? From insufficient marketing to the customers not being able to tell the difference. Who gets to pay the cost of raw materials, changes in production and marketing in that case?
To me it seems like there's a high risk involved for the company and next to no risk involved for the idea guy. To sell your idea, you'd need to convince them the risk is worth, probably by providing data, or doing study where people prefer your product by a large enough margin to give the company a dominant status in the market, or at least cover their expenses after a certain amount of time.
You should also make sure your idea does not suffer from personal biases. For example, if someone would say that everyone they know likes tea, therefore pasta tea would make the company billions, that would likely be a wrong assumption. Even if everyone in their circle would enjoy pasta tea, that doesn't necessarily apply to the general population.
If you believe you can convince a company to take on your idea, you should try to find a way to contact their product manager (if you haven't already) and if they're interested in hearing you out, you should get some lawyers involved to help you not get screwed by the company. The alternative would be pitching your idea to investors and creating your own company. This would likely mean more income for you but you'd need to get involved in most aspects of your new company.
I hope you don't perceive my comments as too negative, I'm mostly trying to provide feedback.