Cook ground beef, crumbling as it cooks. While that is cooking, combine dry ingredients. Add seasonings to skillet with cilantro, lime juice and water.
Continue cooking, stirring occasionally, until the liquid has been absorbed.
We like to use fresh corn tortillas and cook them on a greased griddle until they are soft and starting to turn brown. Update: We have recently been toasting them over an open flame on our gas stove. That makes them lower calories and fat. Suggested garnishes include: cheese, fresh, chopped cilantro, sliced green onion, salsa, chopped lettuce, chopped tomato or guacamole.