Sosu is the maker of the original Sriracha, so there were no legal issues involved in coming up with the name of this blend: Srirachup. It’s billed as containing “sweet & spicy organic ketchup with a kick of our spicy Sriracha.” Judging by that description, I imagine this being pretty tasty ketchup, provided you like Sriracha. I’d have to do a taste test to see how it compares with the spicy ketchup at Whataburger, though.
If you’d like to arrange a taste test of your own, you can buy a jar of Sosu Srirachup at Sosu’s own online store here. You can also get some more information on Sosu’s other sauces, plus recipes and other little sauce-related tidbits.