A problem with a patent or copyright is that you have to tell the world how you do what you do. You can't get intellectual protection (or even apply for protection) and also keep your idea a secret. In our business, on many occasions, we will not apply for patent protection on certain data processing methods because we don't want to tell our competitors how we did things.
If you wrote a book around your recipe you might get copyright protection, but I'm pretty sure it would not get you any protection from a competitor using your recipe. That's not what copyright law is designed to do. For that, you would need a patent. There is so much prior art with something like pizza, it is hard to imagine a scenario where your idea would be novel enough to be patentable.
My $0.02 would be that if you have something that is better than everything else, raise some money and open a restaurant. You sell equity in your business - the investor gives you cash, and he gets ownership in a % of the business in return. Friends and family are the best place to start. They know and trust you and also know how good your food is. Invite them to pizza tastings and tell them what you are trying to do. Many pizza business, some quite famous, have started like this.
One last piece of advice I'd give is to ignore the positive feedback and ask for and listen carefully to the negative. Those are the challenge you will need to overcome if you go into business.
Best of luck,