I know you probably don't want to hear this, but I think if anything you are not nearly worried enough about what you have been feeding your cats. Because yes, salmonella and yellow fat are two things that could happen, but unless you have been adding the right amount of taurine you cats could go blind, and unless you have been supplementing the proper amount of bone meal, and internal organs, and other vitamins your cats can develop other serious problems.
You need to do one of two things:
1. Do a serious study of feline nutrition and understand what they need and just as important in what proportions and make all the food yourself. There are stickies in the nutrition section of this forum that are a good starting point, but I and others can point you in other directions if this is the route you want to go.
2. Get out of the home cat food manufacturing business (which is essentially what you are doing now, haphazardly) and find some nutritionally complete commercial foods that your cats will enjoy.
Honestly, it's not near as simple as whether to feed your cat peas, or whether to feed raw (when people talk about "raw", it is actually less about whether or not the food is cooked or not, and more about making nutritionally complete food with high quality ingredients at home, it's just that they generally choose not to cook it), or whether to feed tuna or other meats, because the answer to all those questions is yes *IF* you do it properly. And that requires a lot of effort and learning on your part.
My suggestion is that you go out to your local pet store, and come back with a bunch of different canned (or nutritionally complete commercial raw mixes) cat foods (brands and flavors) that are going to be the closest thing to what you've been feeding your cats, and see if any of them strike your cats' fancy. I'm not sure where you are but here in the States things like Weruva, Tiki Cat, Earthborn Hollistic, Against The Grain, and others that are not "pate style", and feature basically chunks of meat, in a nutritionally complete mix, will give you the best chance of success. And if your cats don't like those keep trying other brands and flavors until you find something that works, and stick to that. In the meantime, the "ala carte" things you are giving them need to stop for the most part. It is ok to give occasional treats, but that shouldn't make up more than 10% (or less) of their diet. Not to mention giving them really bad eating habits. It's kind of like a mother feeding their kids potato chips and hamburgers for every meal.
If you are interested in learning at least the high level "quick and dirty" overview of what to feed your cat and why, I recommend this book:
http://smile.amazon.com/What-Cats-Shoul ... t+cats+eat