Add the beef, pork, and sausage and cook, stirring to break up the meat with a wooden spoon, until the meat is browned and no bits of pink remain, about 5 to 6 minutes.Stir in onion, fennel, chiles, garlic, chili powder, cumin, 1 teaspoon of the salt, fennel seed, cayenne pepper, and tomato paste, and cook until the vegetables are softened, about 4 to 5 minutes.