Dana’s Low-Carb Gluten-Free No-Sugar Ketchup Redux. My most-published recipe has been my ketchup, appearing in most of my cookbooks. But since the last time I published it, I discovered I like it better made with tomato sauce than with tomato paste – it’s less likely to separate. So here you go! Feel free to double this if you’re going to use it as an ingredient in a barbecue sauce or meatloaf or something.