Break up rinds. If you are using salted pork rinds, mix them with water. Bring to a boil, and drain. If unsalted, skip this step. Combine rinds, onion, tomato, cilantro, chilies, vinegar, and 1 cup water. Season to your liking. Bring to a boil, then simmer 10 - 15 minutes. Heat corn tortillas on a griddle. Fill with mixture and serve.