In a large cast-iron skillet or Dutch oven, cook beef and onion over medium heat until meat is no longer pink; drain. Add water and seasonings. Bring to a boil. Reduce heat; simmer, uncovered, until the water is evaporated, about 15 minutes.
You can serve Seasoned Taco Meat in a variety of ways. Use it as a filling for tacos or enchiladas, or as a topping for pizza or baked potatoes.