I've been enjoying King Taco's red sauce for years. Whatever is in it, they're not telling. I've heard that only 2 people in the company have the recipe. I'm thinking the sauce is more of a curry than a usual Mexican style chili based hot sauce. The flavors are very complex with strong citrus, coriander, allspice, and a hint of smoke. There might be some cayenne or habanero powder in there too which gives it the "kick". I'll keep experimenting.